uu.seUppsala University Publications
Change search
Refine search result
2345 201 - 247 of 247
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 201.
    Tsybin, Youri O.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Witt, Matthias
    Baykut, Gökhan
    Håkansson, Per
    Electron Capture Dissociation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry in the Electron Energy Range 0-50 eV2004In: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, E-ISSN 1097-0231, Vol. 18, no 14, p. 1607-1613Article in journal (Refereed)
    Abstract [en]

    Electron capture dissociation (ECD) of polypeptide cations was obtained with pencil and hollow electron beams for both sidekick and gas-assisted dynamic ion trapping (GADT) using Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) with an electrostatic ion transfer line. Increasing the number of trapped ions by multiple ICR trap loads using GADT improved the ECD sensitivity in comparison with sidekick ion trapping and ECD efficiency in comparison with single ion trap load by GADT. Furthermore, enhanced sensitivity made it possible to observe ECD in a wide range of electron energies (0-50 eV). The degree, rate and fragmentation characteristics of ECD FTICR-MS were investigated as functions of electron energy, electron irradiation time, electron flux and ion trapping parameters for this broad energy range. The results obtained show that the rate of ECD is higher for more energetic (>1 eV) electrons. Long electron irradiation time with energetic electrons reduces average fragment ion mass and decreases efficiency of formation of c- and z-type ions. The obtained dependencies suggest that the average fragment ion mass and the ECD efficiency are functions of the total fluence of the electron beam (electron energy multiplied by irradiation time). The measured electron energy distributions in low-energy ECD and hot ECD regimes are about 1 eV at full width half maximum in employed experimental configurations.

  • 202.
    Tsybin, Youri O.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Witt, Matthias
    Kjeldsen, Frank
    Baykut, Gökhan
    Håkansson, Per
    Combined Infrared Multiphoton Dissociation and Electron Capture Dissociation with a Hollow Electron Beam in Fourier Transform Ion Cyclotron Resonance Mass Spectrometry2003In: Rapid Communications in Mass Spectrometry, Vol. 17, p. 1759-Article in journal (Refereed)
  • 203.
    Tsybin, Youri O
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Witt, Mattias
    Baykut, Gökhan
    Kjeldsen, Frank
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Håkansson, Per
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Combined infrared multiphoton dissociation and electron capture dissociation with a hollow electron beam in fourier transform ion cyclotron resonance mass spectrometry2003In: Rapid Commun. Mass Spectrom., no 17, p. 10-Article in journal (Refereed)
  • 204. Usoskin, Ilya G.
    et al.
    Field, CV
    Schmidt, GA
    Leppanen, AP
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Kovaltsov, GA
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Ungar, R. Kurt
    Short-term production and synoptic influences on atmospheric Be-7 concentrations2009In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 114, p. D06108-Article in journal (Refereed)
    Abstract [en]

    Variations of the cosmogenic radionuclide Be-7 in the global atmosphere are driven by cooperation of processes of its production, air transports, and removal. We use a combination of the Goddard Institute for Space Studies ModelE and the OuluCRAC: Be-7 production model to simulate the variations in the Be-7 concentration in the atmosphere for   the period from 1 January to 28 February 2005. This period features significant synoptic variability at multiple monitoring stations around the globe and spans an extreme solar energetic particle (SEP) event that occurred on 20 January. Using nudging from observed horizontal winds, the model correctly reproduces the overall level of the measured   Be-7 concentration near ground and a great deal of the synoptic variability at timescales of 4 days and longer. This verifies the combined model of production and transport of the Be-7 radionuclide in   the atmosphere. The impact of an extreme SEP event of January 2005 is   seen dramatically in polar stratospheric Be-7 concentration but is small near the surface (about 2%) and indistinguishable given the amount of intrinsic variability and the uncertainties of the surface observations.

  • 205. Usoskin, Ilya G
    et al.
    Fieldy, Cristy V
    Schmidt, Gavin A
    Leppanen, Ari-Pekka
    Aldahan, Ala
    Kovaltsov, Gennady A
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Ungar, R Kurt
    Cosmogenic isotope 7Be as a tracer for air mass dynamics2009Conference paper (Refereed)
  • 206. Vartanyan, Sergey L.
    et al.
    Arslanov, Khikmat A.
    Karhu, Juha A.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Sulerzhitsky, Leopold D.
    Collection of radiocarbon dates on the mammoths (Mammuthus primigenius) and other genera of Wrangel Island, northeast Siberia, Russia2008In: Quaternary Research, ISSN 0033-5894, E-ISSN 1096-0287, Vol. 70, no 1, p. 51-59Article in journal (Refereed)
    Abstract [en]

    We present and discuss a full list of radiocarbon dates for woolly mammoth and other species of the Mammoth fauna available from Wrangel Island, northeast Siberia, Russia. Most of the radiocarbon dates are published here for the first time. Of the 124 radiocarbon dates on mammoth bone, 106 fall between 3700 and 9000 yr ago. We believe these dates bracket the period of mammoth isolation oil Wrangel Island and their ultimate extinction, which we attribute to natural causes. The absence of dates between 9-12 ka probably indicates a period when mammoths were absent from Wrangel Island. Long bone dimensions of Holocene mammoths from Wrangel Island indicate that these animals were comparable in size to those on the mainland, although they were not large animals, neither can they be classified as dwarfs. Occurrence of mammoth Holocene refugia on the mainland is suggested. Based on other species of the Mammoth fauna that have also been radiocarbon on Wrangel Island, including horse, bison, musk ox and woolly rhinoceros, it appears that the mammoth was the only species of that fauna that inhabited Wrangel Island in the mid-Holocene.

  • 207. Veres, Daniel
    et al.
    Davies, Siwan M.
    Wohlfarth, Barbara
    Preusser, Frank
    Wastegård, Stefan
    Ampel, Linda
    Hormes, Anne
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Raynal, Jean-Paul
    Vernet, Gerard
    Age, origin and significance of a new middle MIS 3 tephra horizon identified within a long-core sequence from Les Echets, France2008In: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 37, no 3, p. 434-443Article in journal (Refereed)
    Abstract [en]

    A new tephra has been identified within a long core (EC 3) sequence recovered from Les Echets, near Lyon, France. This visible tephra was discovered as part of a high resolution multiproxy re-investigation of the Les Echets sequence. Independent chronological information suggests that the tephra is c. 2 000-45 000 years old, and geochemical analysis indicates that it is of basanitic composition. The latter suggests a possible origin in the Eifel, however, as yet, no other volcanic events or deposits can be correlated to the Les Echets tephra. New sedimentological and chronological data are presented indicating that the tephra falls within an interval that most likely correlates with Dansgaard-Oeschger events 12-9. Thus, this tephra could potentially be an important middle MIS 3 marker horizon in central Europe if it can be traced in other palaeorecords.

  • 208. Veski, Siim
    et al.
    Heinsalu, Atko
    Lang, Valter
    Kestlane, Ulo
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    The age of the Kaali meteorite craters and the effect of the impact on the environment and man: evidence from inside the Kaali craters, island of Saaremaa Estonia2004In: Veg Hist and Archaeobot journ, no 13, p. 197-206Article in journal (Refereed)
  • 209. Vines, L.
    et al.
    Monakhov, E.
    Maknys, K.
    Svensson, B. G.
    Jensen, Jens
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Hallén, Anders
    Scanning probe microscopy of single Au ion impacts in Si2005In: Presented at the European Material Research Society (E-MRS 2005) Spring meeting, 2005Conference paper (Other scientific)
  • 210. Vines, L.
    et al.
    Monakhov, E.
    Maknys, K.
    Svensson, B.G.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hallén, A.
    Kuznetsov, A.Y.
    Scanning probe microscopy of single Au-ion implants in Si2006In: Materials Science and Engineering C, Vol. 26, p. 782-Article in journal (Refereed)
  • 211. Vines, L.
    et al.
    Monakhov, E.
    Maknys, K.
    Svensson, B.G.
    Kuznetsov, A.
    Jensen, Jens
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Hallén, Anders
    Scanning capacitance microscopy of Si implanted with single Au+ ions2005In: Presented at the 21st Nordic Semiconductor Meeting, Oslo, Norway, 2005Conference paper (Other (popular scientific, debate etc.))
  • 212. Vines, L.
    et al.
    Monakhov, E.
    Svensson, B.G.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Hallén, A.
    Kuznetsov, A.Y.
    Visualization of MeV ion impacts in Si2006In: Physical Review B, Vol. 73, p. 085312-Article in journal (Refereed)
  • 213. Vines, L
    et al.
    Monakhov, EV
    Jensen, J
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Kuznetsov, A Yu
    Svensson, BG
    Effect spatial defect distribution on the electrical behavior of prominent vacancy points defects in swift-ion implanted Si2009In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 7, p. 075206-Article in journal (Refereed)
    Abstract [en]

    Samples of epitaxially grown n-type silicon have been implanted at room   temperature with low doses (10(6)-10(9) cm(-2)) of He, C, Si, and I   ions using energies from 2.75 to 46 MeV. Deep level transient   spectroscopy studies reveal that the generation of divacancy (V-2) and   vacancy-oxygen (VO) pairs has a distinct ion mass dependence.   Especially, the doubly negative charge state of the divacancy,   V-2(=/-), decreases in intensity with increasing ion mass compared to   that of the singly negative charge state of the divacancy, V-2(-/0). In   addition, the measurements show also a decrease in the intensity of the   level assigned to VO compared to that of V-2(-/0) with increasing ion   mass. Carrier capture cross-section measurements demonstrate a   reduction in the electron capture rate with increasing ion mass for all   the three levels V-2(-/0), V-2(=/-), and VO; but a gradual recovery   occurs with annealing. Concurrently, the strength of the V-2(-/0) level   decreases in a wide temperature range starting from below 200 degrees   C, accompanied by an increase in the amplitudes of both the VO and   V-2(=/-) peaks. In order to account for these results a model is   introduced where local carrier compensation is a key feature and where   two modes of V-2 are considered: (1) V-2 centers located in regions   with a high defect density around the ion track (V-2(dense)) and (2)   V-2 centers located in regions with a low defect density (V-2(dilute)).   The V-2(dense) fraction does not give any contribution to the V-2(=/-)   signal due to local carrier compensation, and the amplitude of the   V-2(=/-) level is determined by the V-2(dilute) fraction only. The   spatial distributions of defects generated by single-ion impacts were   simulated by Monte Carlo calculations in the binary collision   approximation, and to distinguish between the regions with V-2(dense)   and V-2(dilute) a threshold for the defect generation rate was   introduced. The model is shown to give good quantitative agreement with   the experimentally observed ion mass dependence for the ratio between   the amplitudes of the V-2(=/-) and V-2(-/0) peaks. In particular, the   threshold value for the defect generation rate remains constant   (similar to 1.2 vacancies/ion/A) irrespective of the type of ion used,   which provides strong evidence for the validity of the model. Annealing   at temperatures above similar to 300 degrees C is found to reduce the   spatial localization of the defects and migration of V-2 occurs with   subsequent trapping by interstitial oxygen atoms and formation of   divacancy-oxygen pairs.

  • 214. Vines, L
    et al.
    Monakhov, EV
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Kuznetsov, A Yu
    Svensson, BG
    Formation and annealing behavior of prominent point defects in MeV ion implanted n-type epitaxial Si2009In: Materials Science & Engineering: B. Solid-state Materials for Advanced Technology, ISSN 0921-5107, E-ISSN 1873-4944, Vol. 159-160, p. 177-181Article in journal (Refereed)
    Abstract [en]

    Samples of epitaxially grown n-type Si have been implanted with low doses (< 1 x 10(9) cm(-1)) of He, C, Si, and I ions using energies from 2.75 to 48 MeV. Deep level transient spectroscopy (DLTS) analysis of the implanted samples reveals a stronger signal for the signature of the singly negative charge state of the divacancy (V-2(-/0)) as compared to that of the doubly negative charge state of the divacancy (V-2(=/-)). Isochronal annealing for 20 min ranging from 150 to 400 degrees C results in a gradual decrease ill the DLTS peak amplitude of the V-2(-/0) signature, accompanied by an increase in the peak amplitudes of both the vacancy oxygen pair (VO) and the V-2(=/-) levels, as well as an increase in the carrier Capture rates for the levels. A model based on local compensation of charge carriers front individual ion tracks is proposed in order to explain the results, involving two fractions of V-2: (1) V-2 centers localized in regions with high defect density around the ion track (V-2(dense)) and (2) V-2 centers located in regions with a low defect density (V-2(dilute)).

  • 215. Vines, L.
    et al.
    Monakhov, E.V.
    Kuznetsov, A.Y.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Svensson, B.G.
    Correlation between divacancy acceptor states in ion implanted n+p Si diodes studied by DLTS2006Conference paper (Other (popular science, discussion, etc.))
  • 216. Vuckovic, S
    et al.
    Popok, V N
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Nanostructure formation on rutile TiO2 surfaces by low-energy cluster and high-energy ion impact2008In: Book of Abstracts, Dresden, Germany, 2008Conference paper (Refereed)
  • 217. Wastegård, Stefan
    et al.
    Rundgren, Mats
    Schoning, Kristian
    Andersson, Sofia
    Björck, Svante
    Borgmark, Anders
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra2008In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 18, no 4, p. 539-549Article in journal (Refereed)
    Abstract [en]

    The middle Holocene Hekla-S/Kebister tephra originates in the Hekla volcanic system on SW Iceland. The distal distribution of the tephra includes the Faroe Islands, Shetland and Central Sweden, indicating a main dispersal towards the east. The chemical composition of the tephra follows the pattern of other major eruptions of Hekla, and ratios between selected oxides may in some cases allow separation from other major Holocene tephras from Hekla. Tephra from the Plinian phase dominates in eastern sites, while tephra also from later phases is found in the Faroe sites. Wiggle-matching of radiocarbon dates around the tephra in a Swedish peat-bog suggests an age around 3720 cal. yr BP (3750-3700 cal. yr BP), which is in accordance with previous attempts to date this tephra. This is within a period with significant climate changes in NW Europe and opens possibilities for exact comparisons of peat and lake sediment records from different geographical areas.

  • 218.
    Westlinder, Jörgen
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Fasta tillståndets elektronik.
    Zhang, Yanwen
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Jonfysik.
    Engelmark, Fredrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Fasta tillståndets elektronik.
    Blom, Hans-Olof
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Fasta tillståndets elektronik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Jonfysik.
    Berg, Sören
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Electronics. Ion Physics. Fasta tillståndets elektronik.
    Simulation and dielectric characterization of reactive DC magnetron Co-sputtering of (Ta2O5)1-x(TiO2)x2000In: American Vacuum Society 47th National Symposium 2000 Boston, USA, 2000Conference paper (Refereed)
  • 219. Wohlfarth, B
    et al.
    Blaauw, M
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Davies, SM
    Andersson, M
    Wastegård, S
    Hormes, A
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, G
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Constraining the age of Lateglacial and early Holocene pollen zones and tephra horizons in southern Sweden with Bayesian probability methods2006In: Journal of Quaternary Science, Vol. 21, p. 321-334Article in journal (Refereed)
  • 220. Wohlfarth, B.
    et al.
    Schwark, L.
    Bennike, O.
    Filimovova, L.
    Tarasov, P.
    Björkman, L.
    Brunnberg, L.
    Demidov, I
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Unstable early-holocene climate and enviromental conditions in northwestern Russia derived from a multidisciplinary study of a lake- sediment sequence from pichozero southeastern Russia Karelia2004In: Holocene, Vol. 14, no 5, p. 732-746Article in journal (Refereed)
  • 221. Wohlfarth, Barbara
    et al.
    Veres, Daniel
    Ampel, Linda
    Lacourse, Terri
    Blaauw, Maarten
    Preusser, Frank
    Andrieu-Ponel, Valerie
    Keravis, Didier
    Lallier-Verges, Elisabeth
    Björck, Svante
    Davies, Siwan M.
    de Beaulieu, Jacques-Louis
    Risberg, Jan
    Hormes, Anne
    Kasper, Haino Uwe
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Reille, Maurice
    Thouveny, Nicolas
    Zander, Anja
    Rapid ecosystem response to abrupt climate changes during the last glacial period in western Europe, 40-16 ka2008In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 36, no 5, p. 407-410Article in journal (Refereed)
    Abstract [en]

    We present a high-resolution and independently dated multiproxy lake sediment record from the paleolake at Les Echets in southeastern France that displays synchronous changes in independent limnic and terrestrial ecosystem proxies, in concert with millennial-scale climate oscillations during the last glacial period. Distinct lake-level fluctuations, low lake organic productivity, and open, treeless vegetation indicate cold and dry conditions in response to Heinrich events. Alternating phases of higher and low lake organic productivity, stratified surface waters and long-lasting lake ice cover, decreased or increased catchment erosion, and tree-dominated or herb-dominated vegetation resemble Dansgaard-Oeschger interstadial-stadial variability. Transitions between different ecological states occurred in as little as 40-230 yr and seem to have been controlled by the position of the Polar Front. Ecosystem response after 30 ka suggests that local climate conditions became more important. Our results demonstrate that all parts of the terrestrial system responded to the abrupt and dramatic climatic changes associated with Dansgaard-Oeschger and Heinrich events, and that regional factors modulated ecosystem response.

  • 222. Wolborski, M
    et al.
    Martin, David
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Bakowski, M
    Hallén, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Katardjiev, Ilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Improved properties of AlON/4H-SiC interface for passivation2007Conference paper (Refereed)
  • 223. Zaitseva, G.
    et al.
    Skripkin, V.
    Kovaliukh, N.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Dolukhanov, P.
    Vybornov, A.
    Radiocarbon dating of neolithic pottery2009In: Radiocarbon, ISSN 0033-8222, E-ISSN 1945-5755, Vol. 51, no 2, p. 795-801Article in journal (Refereed)
    Abstract [en]

    The direct measurement of organic matter included in archaeological pottery may yield a reliable assessment of age. The main problem consists in the identification of possible origins and assessment of distortion for the age of organic inclusions. Our experiments show that shells included in pottery fabrics are strongly influenced by the reservoir effect, which may reach 500 yr or more. Other organic inclusions, such as lake ooze, do not visibly distort the age. The obtained series of radiocarbon dates have been used for the assessing the age of the early stages of pottery manufacture in southern Russia.

  • 224. Zettergren, H.
    et al.
    Reinhed, P.
    Stochkel, K.
    Schmidt, H.T.
    Cederquist, H.
    Jensen, Jens
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Fragmentation and Ionization of C70 and C60 – a comparison2005In: Presented at the 24rd International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2005), Rosario, Argentina, 2005Conference paper (Other (popular scientific, debate etc.))
  • 225. Zettergren, H.
    et al.
    Reinhed, P.
    Støchkel, K.
    Schmidt, H.T.
    Cederquist, H.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Tomita, S.
    Nielsen, S.B.
    Hvelplund, P.
    Manil, B.
    Rangama, J.
    Huber, H.A.
    Fragmentation and ionization of C_70 and C_60 by slow ions of intermediate charge2006In: The European Physical Journal D, Vol. 38, p. 299-Article in journal (Refereed)
  • 226. Zettergren, H.
    et al.
    Schmidt, H. T.
    Cederquist, H.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hvelplund, P.
    Tomita, S.
    Manil, B.
    Rangama, J.
    Huber, B.A.
    Even-odd effects in the ionization cross sections of [C60]2 and [C60C70] dimers2007In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 75, no 5, p. 051201-Article in journal (Refereed)
    Abstract [en]

    We report strong even-odd effects in multiple ionization yields of van der Waals dimers in slowXe30+ + ͓C60͔2͓͑C60C70͔͒ →  ̄ + ͓C60͔2r+͓͑C60C70͔r+͒ electron-transfer collisions as functions of r Յ 7. Thisbehavior may be due to even-odd variations in the sequences of dimer ionization energies as calculated with anelectrostatic model including an electrical fullerene-fullerene contact at the 19a0 center-center separation in͓C60͔2+. Prompt dissociations predominantly yield intact fullerenes ͓C60͔2r+ → C60r1+ + C60r2+ in the same͑r1 = r2, even r͒ or nearby ͑r1 = r2 ± 1, odd r Ͼ 1͒ charge states.

  • 227.
    Zettergren, H.
    et al.
    Stockholms universitet.
    Schmidt, H.T.
    Stockholms universitet.
    Reinhed, P.
    Stockholms universitet.
    Cederquist, H.
    Stockholms universitet.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hvelplund, P.
    Department of Physics and Astronomy, University of Aarhus.
    Tomita, S.
    Institute of Applied Physics, University of Tsukuba.
    Manil, B.
    Centre Interdisciplinaire Recherches Ions Lasers (CIRIL).
    Rangama, J.
    Centre Interdisciplinaire Recherches Ions Lasers (CIRIL).
    Huber, B.A.
    Centre Interdisciplinaire Recherches Ions Lasers (CIRIL).
    Stabilities of multiply charged dimers and clusters of fullerenes2007In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 126, no 22, p. 224303-Article in journal (Refereed)
    Abstract [en]

    The authors find even-odd variations as functions of r (...+[C60]2(r+)([C60C70](r+)) electron-transfer collisions. This even-odd behavior is in sharp contrast to the smooth one for fullerene monomers and may be related to even-odd effects in dimer ionization energies in agreement with results from an electrostatic model. The kinetic energy releases for dimer dissociations [predominantly yielding intact fullerenes [C60]2(r+)-->C60(r1+)+C60(r2+) in the same (r1=r2) or nearby (r1=r2+/-1) charge states] are found to be low in comparison with the corresponding model results indicating that internal excitations of the separating (intact) fullerenes are important. Experimental appearance sizes for the heavier clusters of fullerenes [C60]n(r+) (n>3 and r=2-5) compare well with predictions from a new nearest-neighbor model assuming that r unit charges in [C60]n(r+) are localized to r C60 molecules such that the Coulomb energy of the system is minimized. The system is then taken to be stable if (i) two (singly) charged C60 are not nearest neighbors and (ii) the r C60(+) molecules have binding energies to their neutral nearest neighbors which are larger than the repulsive energies for the (r-1) C60(+)-C60(+) pairs. Essential ingredients in the nearest-neighbor model are cluster geometries and the present results on dimer stabilities.

  • 228.
    Zhang, Y.
    et al.
    Pacific Northwest National Laboratory.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Grove, D.A.
    Bae, I.T.
    Pacific Northwest National Laboratory.
    Weber, W.J.
    Pacific Northwest National Laboratory.
    Stopping power measurements of He ions in Si and SiC by time-of-flight spectrometry2007In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 261, no 1-2, p. 1180-1183Article in journal (Refereed)
    Abstract [en]

    A straightforward approach is introduced to determine electronic stopping powers of He ions in Si and SiC over a continuous range of energies. In transmission geometry, the energy loss of He ions in self-supporting stopping foils of Si and SiC is measured using a time-of-flight (TOF) set-up. The energy of individual ions prior to impingement on the foil is determined from its TOF data; the exit energy after the stopping foil is measured using a Si detector, for which every channel has been calibrated using the TOF data without the stopping foil present. The measured stopping powers demonstrate excellent repeatability of this experimental approach and good reliability as compared with previous data from the literature and theoretical predictions.

  • 229. Zhang, Y.
    et al.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Grove, D.A.
    McCready, D.E.
    Arey, B.W.
    Weber, W.J.
    Electronic stopping forces of heavy ions in metal oxides2006In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 249, p. 18-21Article in journal (Refereed)
  • 230. Zhang, Y
    et al.
    McCready, D.E.
    Wang, C.W.
    Young, J.
    McKinley, M.I.
    Whitlow, H.J.
    Razpet, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Zhang, T.
    Wu, Y.
    Formation of cobalt silicide films by ion beam deposition2006In: Nucl. Instr. and Meth. in Phys. Res., no 242, p. 602-604Article in journal (Refereed)
  • 231. Zhang, Y.
    et al.
    Weber, W.J.
    Grove, A.
    Jensen, Jens
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Electronic Stopping Powers for Swift Heavy Ions in Compounds2005In: Presented at he 13th International Conference on Radiation Effects in Insulators (REI-2005),Santa Fe, New Mexico USA, 2005Conference paper (Other scientific)
  • 232. Zhang, Y.
    et al.
    Weber, W.J.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Electronic stopping powers for heavy ions in niobium and tatalum pentoxides2006In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 250, p. 62-65Article in journal (Refereed)
  • 233.
    Zhang, Yanwen
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    McCready, D. E.
    Wang, C. M.
    Young, J.
    Kinley, M. I.
    Whitlow, Harry
    Razpet, Alenka
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Zhang, T.
    Wu, Y.
    Formation of Silicide Films by Ion Beam Deposition2005In: Nucl. Inst. and Methods in Phys Res, no B242, p. 602-Article in journal (Refereed)
  • 234.
    Zhang, Yanwen
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Weber, W J
    Jiang, W
    Wang, C M
    Hallén, A
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Effects of implantation temperature and ion flux on damage accumulation in Al-implanted 4H-SiC2003In: J. Appl. Phys., Vol. 93, no 4, p. 7-Article in journal (Refereed)
  • 235. Zhang, Yanwen
    et al.
    Weber, W. J.
    McCready, D. E.
    Grove, D. A.
    Jensen, Jens
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Experimental determination of electronic stopping for ions in silicon dioxide2005In: Appl. Phys. Lett., Vol. 87, no 10Article in journal (Refereed)
  • 236.
    Zhang, Yanwen
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Weber, W. J.
    Razpet, Alenka
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Electronic stopping powers for He, Be and F ions in Au2005In: Nucl. Inst. Methods, no B227, p. 479-484Article in journal (Refereed)
  • 237. Zhang, Yanwen
    et al.
    Weber, W.J.
    Razpet, Alenka
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Electronic Stopping Powers for Be, Ca and Ti in SiC2005In: Nucl. Inst. and Methods in Phys. Res., no B242, p. 82-Article in journal (Refereed)
  • 238. Zhu, Liping
    et al.
    Zhen, Xiaolin
    Wang, Junbo
    Lü, Houyuan
    Xie, Manping
    Kitagawa, Hiroyki
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    A similar to 30,000-year record of environmental changes inferred from Lake Chen Co, Southern Tibet2009In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 42, no 3, p. 343-358Article in journal (Refereed)
    Abstract [en]

    Climatic and environmental changes since the last glacial period are important to our understanding of global environmental change. There   are few records from Southern Tibet, one of the most climatically   sensitive areas on earth. Here we present a study of the lake sediments   (TC1 core) from Lake Chen Co, Southern Tibet. Two sediment cores were   drilled using a hydraulic borer in Terrace 1 of Lake Chen Co. AMS C-14   dating of the sediments showed that the sequence spanned > 30,000   years. Analyses of present lake hydrology indicated that glacier melt   water is very important to maintaining the lake level. Sediment   variables such as grain size, TOC, TN, C/N, Fe/Mn, CaCO3, and pollen   were analyzed. Warm and moderately humid conditions dominated during   the interval 30,000-26,500 cal year BP. From 26,500 to 20,000 cal year   BP, chemical variables and pollen assemblages indicate a cold/dry   environment, and pollen amounts and assemblages suggest a decline in   vegetation. From 20,000 to 18,000 cal year BP, the environment shifted   from cold/dry to warm/humid and vegetation rebounded. The environment   transitioned to cold/humid during 16,500-10,500 cal year BP, with a   cold/dry event around 14,500 cal year BP. After 10,500 cal year BP, the   environment in this region tended to be warm/dry, but exhibited three   stages. From 10,500 to 9,000 cal year BP, there was a short warm/humid   period, but a shift to cold/dry conditions occurred around 9,000 cal   year BP. Thereafter, from 9,000 to 6,000 cal year BP, there was a   change from cold/dry to warm/humid conditions, with the warmest period   around 6,000 cal year BP. After 6,000 cal year BP, the environment   cooled rapidly, but then displayed a warming trend. Chemical variables   indicate that a relatively warm/dry event occurred around 5,500-5,000   cal year BP, which is supported by time-lagged pollen assemblages   around 4,800 cal year BP. Our lake sediment sequence exhibits   environmental changes since 30,000 cal year BP, and most features agree   with records from the Greenland GISP2 ice core and with other sequences   from the Tibetan Plateau. This indicates that environmental changes   inferred from Lake Chen Co, Southern Tibet were globally significant.

  • 239.
    Zubarev, Roman
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Protein primary structure using orthogonal fragmentation techniques in Fourier transform mass spectrometry2006In: Expert Rev. Proteomics, no 3, p. 251-261Article in journal (Refereed)
  • 240.
    Zubarev, Roman
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Revealing the proteome complexity by mass spectrometry2006In: Computer Sci, no 3909, p. 456-457Article in journal (Refereed)
  • 241.
    Zubarev, Roman A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. jonfysik.
    Electron-capture dissociation tandem mass spectrometry.2004In: Curr Opin Biotechnol, ISSN 0958-1669, Vol. 15, no 1, p. 12-6Article in journal (Refereed)
  • 242.
    Zubarev, Roman A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. jonfysik.
    Reactions of polypeptide ions with electrons in the gas phase.2003In: Mass Spectrom Rev, ISSN 0277-7037, Vol. 22, no 1, p. 57-77Article in journal (Other scientific)
  • 243.
    Zubarev, Roman A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Abeywarna, UK
    Demirev, Plamen A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Eriksson, J
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Papaleo, R
    Håkansson, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Sundqvist, Bo U. R.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Delayed, gas-phase ion formation in plasma desorption mass spectrometry1997In: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, E-ISSN 1097-0231, Vol. 11, no 9, p. 963-972Article in journal (Refereed)
    Abstract [en]

    The formation mechanisms of secondary ions from organic targets under MeV ion bombardment were studied with a high-resolution time-of-flight (TOF) mass spectrometer. Promptly formed ions Hn+, Cn+ and CnH+ were used for calibrating the TOF scale. Theoretical flight times of other ions were calculated according to the calibration curve and compared to experimentally determined values. The TOF values of non-specific low mass fragments formed via rearrangement or breaking of several bonds and/or abstraction of several atoms, agree well with the theoretical values. On the other hand, target-specific organic ions, including molecular ions of peptides, have longer TOF values than predicted by the calibration curve. Time delays of a few hundred picoseconds were found for low-mass specific fragments, and a few nanoseconds for peptide molecular ions. For protonated species and non-covalent clusters, the delays are larger than for pre-formed and radical molecular ions. Metals contained in organic samples, as contamination, also give delayed ions. For inorganic targets of LiBF4, significant delays were found for the clusters (LiF)nLi+ with n >3. A strong correlation was observed between the delay of an ion and the tailing of its kinetic energy distribution. The conclusion was made that the majority of target-specific ions are formed in the gas phase, at a distance from the target surface of the order of 1 μm.

  • 244.
    Zubarev, Roman A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Demirev, Plamen A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Isotope depletion of large biomolecules: Implications for molecular mass measurements1998In: Journal of the American Society for Mass Spectrometry, ISSN 1044-0305, E-ISSN 1879-1123, Vol. 9, no 2, p. 149-156Article in journal (Other academic)
    Abstract [en]

    Isotope depletion (or enrichment) of large biomolecules is a procedure already used in high resolution Fourier transform ion cyclotron resonance mass spectrometry for improving the reliability and accuracy of biomolecular mass characterization. In this work, effects of isotope depletion on a number of mass spectrometric parameters are systematically studied. Implementation of the isotope depletion techniques in conjunction with lower resolution mass analyzers is discussed as well. We investigate theoretically the position of the centroid of the isotopic mass distributions (centroid mass) and the shift between the monoisotopic and the centroid masses of biopolymers as a function of the isotope abundance (e.g., 12C:13C ratio). The behaviour of other additive mass parameters, like the ratio between the monoisotopic and the first isotopic peak, is also discussed. We address by computer simulations the effects of different instrumental parameters like mass resolution and ion statistics as a function of isotope abundances and from there the achievable mass accuracy for high-mass biopolymers. We assess some of the practical issues of the isotope depletion technique, viz., to what degree and with what accuracy the depletion procedure should be performed for achieving the desired mass accuracy.

  • 245.
    Zubarev, Roman A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Ion Physics. Ion physics.
    Witt, Matthias
    Baykut, Gökhan
    Two-fold efficiency increase by selective excitation of ions for consecutive activation by ion-electron reactions and vibrational excitation in tandem fourier transform ion cyclotron resonance mass spectrometry.2005In: Anal Chem, ISSN 0003-2700, Vol. 77, no 9, p. 2992-6Article in journal (Refereed)
  • 246.
    Zubarev, Roman
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Kjeldsen, Frank
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Dissociative recombination cross section and branching ratios of protonated dimethyl disulfide and N-methylacetamide2004In: J. Chem. Phys, Vol. 121, no 12, p. 5700-5708Article in journal (Refereed)
  • 247.
    Zubarev, Roman
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Mann, M.
    On the proper use of mass accuracy in proteomics2007In: Molecular & Cellular Proteomics, ISSN 1535-9476, E-ISSN 1535-9484, Vol. 6, no 3, p. 377-381Article, review/survey (Refereed)
    Abstract [en]

    Mass measurement is the main outcome of mass spectrometry-based proteomics yet the potential of recent advances in accurate mass measurements remains largely unexploited. There is not even a clear definition of mass accuracy in the proteomics literature, and we identify at least three uses of this term: anecdotal mass accuracy, statistical mass accuracy, and the maximum mass deviation (MMD) allowed in a database search. We suggest using the second of these terms as the generic one. To make the best use of the mass precision offered by modern instruments we propose a series of simple steps involving recalibration of the data on "internal standards" contained in every proteomics data set. Each data set should be accompanied by a plot of mass errors from which the appropriate MMD can be chosen. More advanced uses of high mass accuracy include an MMD that depends on the signal abundance of each peptide. Adapting search engines to high mass accuracy in the MS/MS data is also a high priority. Proper use of high mass accuracy data can make MS-based proteomics one of the most "digital" and accurate post-genomics disciplines.

2345 201 - 247 of 247
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf