uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
BETA
Siegbahn, Hans
Alternative names
Publications (10 of 62) Show all publications
Svensson, S., Siegbahn, H., Nordgren, J. & Mårtensson, N. (2018). Biographical item: "Prof. Carl Nordling 1931-2016 Obituary" in Journal Of Electron Spectroscopy And Related Phenomena, vol 224, Special Issue: SI, pp 107-108. , 224
Open this publication in new window or tab >>Biographical item: "Prof. Carl Nordling 1931-2016 Obituary" in Journal Of Electron Spectroscopy And Related Phenomena, vol 224, Special Issue: SI, pp 107-108
2018 (English)Other (Other (popular science, discussion, etc.))
Series
Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-357035 (URN)10.1016/j.elspec.2016.12.008 (DOI)000428825400017 ()
Note

Minnesord (Obituary)

Available from: 2018-08-10 Created: 2018-08-10 Last updated: 2018-08-10Bibliographically approved
Oscarsson, J., Hahlin, M., Johansson, E. M. J., Eriksson, S. K., Lindblad, R., Eriksson, A. I. K., . . . Rensmo, H. (2016). Coadsorption of Dye Molecules at TiO2 Surfaces: A Photoelectron Spectroscopy Study. The Journal of Physical Chemistry C, 120(23), 12484-12494
Open this publication in new window or tab >>Coadsorption of Dye Molecules at TiO2 Surfaces: A Photoelectron Spectroscopy Study
Show others...
2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 23, p. 12484-12494Article in journal (Refereed) Published
Abstract [en]

The effects of coadsorbing the amphiphilic ruthenium-based dye Z907 (cis-bis(isothiocyanato)(2,20-bipyridy1-4,40-dicarboxylato)(4,40-dinony1-20-bipyridy1)-ruthenium(II)) with the coadsorbent DPA (n-decylphosphonic acid) and with the organic dye D35 ((E)-3-(5-(4-(bis(2',4'-dibutoxybiphenyl-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid) on mesoporous TiO2 were investigated using photoelectron spectroscopy (PES). Z907 is expected to adsorb to the TiO2 surface via the carboxylic acid groups. However, Z907 also shows signs of interacting with the TiO2 via the sulfur of the thiocyanate groups, and this interaction is affected by both the addition of DPA and D35. DPA, when added, exchanges with Z907 at the TiO2 surface, and each Z907 is replaced by six DPA molecules, but it does not affect the energy level alignment between Z907 and TiO2 substantially. Adding D35 to Z907 induces changes in the adsorption configuration of Z907 by the means of suppressing the interaction of the thiocyanate ligands and the TiO2 surface. The HOMO level of Z907 is shifted by the addition of D35. Coadsorbing Z907 with D35 thus gives changes at a molecular level, meaning that this is an example of collaborative sensitization.

National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-299720 (URN)10.1021/acs.jpcc.6b02521 (DOI)000378196200019 ()
Funder
Swedish Energy Agency, P221191-5Swedish Research Council FormasSwedish Research Council, 2014-6018 2012-4721
Available from: 2016-07-26 Created: 2016-07-26 Last updated: 2017-11-28Bibliographically approved
Eriksson, S. K., Hahlin, M., Axnanda, S., Crumlin, E., Wilks, R., Odelius, M., . . . Siegbahn, H. (2016). In-Situ Probing of H2O Effects on a Ru-Complex Adsorbed on TiO2 Using Ambient Pressure Photoelectron Spectroscopy. Topics in catalysis, 59(5-7), 583-590
Open this publication in new window or tab >>In-Situ Probing of H2O Effects on a Ru-Complex Adsorbed on TiO2 Using Ambient Pressure Photoelectron Spectroscopy
Show others...
2016 (English)In: Topics in catalysis, ISSN 1022-5528, E-ISSN 1572-9028, Vol. 59, no 5-7, p. 583-590Article in journal (Refereed) Published
Abstract [en]

Dye-sensitized interfaces in photocatalytic and solar cells systems are significantly affected by the choice of electrolyte solvent. In the present work, the interface between the hydrophobic Ru-complex Z907, a commonly used dye in molecular solar cells, and TiO2 was investigated with ambient pressure photoelectron spectroscopy (AP-PES) to study the effect of water atmosphere on the chemical and electronic structure of the dye/TiO2 interface. Both laboratory-based Al K alpha as well as synchrotron-based ambient pressure measurements using hard X-ray (AP-HAXPES) were used. AP-HAXPES data were collected at pressures of up to 25 mbar (i.e., the vapor pressure of water at room temperature) showing the presence of an adsorbed water overlayer on the sample surface. Adopting a quantitative AP-HAXPES analysis methodology indicates a stable stoichiometry in the presence of the water atmosphere. However, solvation effects due to the presence of water were observed both in the valence band region and for the S 1s core level and the results were compared with DFT calculations of the dye-water complex.

Keywords
Dye-sensitized solar cells, AP-HAXPES, DFT, H2O, Photoelectron spectroscopy
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-282482 (URN)10.1007/s11244-015-0533-3 (DOI)000371424800018 ()
Funder
Swedish Energy Agency, P22191-5Swedish Research Council, VR-2010-4132Swedish Research Council, VR-2014-6019Swedish Research Council, VR-2015-03956StandUpCarl Tryggers foundation , CTS 14:355VINNOVA
Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30Bibliographically approved
Philippe, B., Hahlin, M., Edström, K., Gustafsson, T., Siegbahn, H. & Rensmo, H. (2016). Photoelectron Spectroscopy for Lithium Battery Interface Studies. Journal of the Electrochemical Society, 163(2), A178-A191
Open this publication in new window or tab >>Photoelectron Spectroscopy for Lithium Battery Interface Studies
Show others...
2016 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, no 2, p. A178-A191Article in journal (Refereed) Published
Abstract [en]

Photoelectron spectroscopy (PES) has become an important tool for investigating Li-ion battery materials, in particular for analyzing interfacial structures and reactions. Since the methodology was introduced in the battery research area, PES has undergone a dramatic development regarding photon sources, sample handling and electron energy analyzers. This includes the possibility to use synchrotron radiation with increased intensity and the possibility to vary the photon energy. The aim of the present paper is to describe how PES can be used to investigate battery interfaces and specifically highlight how synchrotron based PES has been implemented to address different questions useful for the development of the Li-ion batteries. We also present some recent developments of the techniques, which have the potential to further push the limits for the use of photoelectron spectroscopy in battery research.

National Category
Materials Chemistry Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-274915 (URN)10.1149/2.0051602jes (DOI)000367324400024 ()
Funder
Swedish Research Council, VR 2012-4681Swedish Energy AgencyStandUp
Available from: 2016-01-27 Created: 2016-01-26 Last updated: 2017-11-30Bibliographically approved
Maibach, J., Xu, C., Eriksson, S. K., Ahlund, J., Gustafsson, T., Siegbahn, H., . . . Hahlin, M. (2015). A high pressure x-ray photoelectron spectroscopy experimental method for characterization of solid-liquid interfaces demonstrated with a Li-ion battery system. Review of Scientific Instruments, 86(4), Article ID 044101.
Open this publication in new window or tab >>A high pressure x-ray photoelectron spectroscopy experimental method for characterization of solid-liquid interfaces demonstrated with a Li-ion battery system
Show others...
2015 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 4, article id 044101Article in journal (Refereed) Published
Abstract [en]

We report a methodology for a direct investigation of the solid/liquid interface using high pressure x-ray photoelectron spectroscopy (HPXPS). The technique was demonstrated with an electrochemical system represented by a Li-ion battery using a silicon electrode and a liquid electrolyte of LiClO4 in propylene carbonate (PC) cycled versus metallic lithium. For the first time the presence of a liquid electrolyte was realized using a transfer procedure where the sample was introduced into a 2 mbar N-2 environment in the analysis chamber without an intermediate ultrahigh vacuum (UHV) step in the load lock. The procedure was characterized in detail concerning lateral drop gradients as well as stability of measurement conditions over time. The X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the solid substrate and the liquid electrolyte can be observed simultaneously. The results show that the solid electrolyte interphase (SEI) composition for the wet electrode is stable within the probing time and generally agrees well with traditional UHV studies. Since the methodology can easily be adjusted to various high pressure photoelectron spectroscopy systems, extending the approach towards operando solid/liquid interface studies using liquid electrolytes seems now feasible. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-255308 (URN)10.1063/1.4916209 (DOI)000353837700037 ()25933870 (PubMedID)
Funder
Swedish Research Council, 2012-4681EU, FP7, Seventh Framework Programme, 608575
Available from: 2015-06-16 Created: 2015-06-15 Last updated: 2017-12-04Bibliographically approved
Lindblad, R., Jena, N. K., Philippe, B., Oscarsson, J., Bi, D., Lindblad, A., . . . Rensmo, H. (2015). Electronic Structure of CH3NH3PbX3 Perovskites: Dependence on the Halide Moiety. The Journal of Physical Chemistry C, 119(4), 1818-1825
Open this publication in new window or tab >>Electronic Structure of CH3NH3PbX3 Perovskites: Dependence on the Halide Moiety
Show others...
2015 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 4, p. 1818-1825Article in journal (Refereed) Published
Abstract [en]

A combination of measurements using photoelectron spectroscopy and calculations using density functional theory (DFT) was applied to compare the detailed electronic structure of the organolead halide perovskites CH3NH3PbI3 and CH3NH3PbBr3. These perovskite materials are used to absorb light in mesoscopic and planar heterojunction solar cells. The Pb 4f core level is investigated to get insight into the chemistry of the two materials. Valence level measurments are also included showing a shift of the valence band edges where there is a higher binding energy of the edge for the CH3NH3PbBr3 perovskite. These changes are supported by the theoretical calculations which indicate that the differences in electronic structure are mainly caused by the nature of the halide ion rather than structural differences. The combination of photoelectron spectroscopy measurements and electronic structure calculations is essential to disentangle how the valence band edge in organolead halide perovskites is governed by the intrinsic difference in energy levels of the halide ions from the influence of chemical bonding.

Place, publisher, year, edition, pages
American Chemical Society: , 2015
National Category
Physical Sciences Chemical Sciences
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-241017 (URN)10.1021/jp509460h (DOI)000348753000024 ()
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2017-12-05Bibliographically approved
Plogmaker, S., Terschlüsen, J. A., Kerbs, N., Svanqvist, M., Forsberg, J., Cappel, U. B., . . . Söderström, J. (2015). HELIOS-A laboratory based on high-order harmonic generation of extreme ultraviolet photons for time-resolved spectroscopy. Review of Scientific Instruments, 86(12), Article ID 123107.
Open this publication in new window or tab >>HELIOS-A laboratory based on high-order harmonic generation of extreme ultraviolet photons for time-resolved spectroscopy
Show others...
2015 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 12, article id 123107Article in journal (Refereed) Published
Abstract [en]

In this paper, we present the HELIOS (High Energy Laser Induced Overtone Source) laboratory, an in-house high-order harmonic generation facility which generates extreme ultraviolet (XUV) photon pulses in the range of 15-70 eV with monochromatized XUV pulse lengths below 35 fs. HELIOS is a source for time-resolved pump-probe/two-color spectroscopy in the sub-50 fs range, which can be operated at 5 kHz or 10 kHz. An optical parametric amplifier is available for pump-probe experiments with wavelengths ranging from 240 nm to 20 000 nm. The produced XUV radiation is monochromatized by a grating in the so-called off-plane mount. Together with overall design parameters, first monochromatized spectra are shown with an intensity of 2 . 10(10) photons/s (at 5 kHz) in the 29th harmonic, after the monochromator. The XUV pulse duration is measured to be <25 fs after monochromatization.

National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-168798 (URN)10.1063/1.4937463 (DOI)000368594900008 ()26724006 (PubMedID)
Funder
Knut and Alice Wallenberg FoundationKnut and Alice Wallenberg FoundationCarl Tryggers foundation Swedish Research Council
Note

De två första författarna delar förstaförfattarskapet.

Available from: 2012-02-15 Created: 2012-02-15 Last updated: 2017-12-07Bibliographically approved
Edwards, M. O. M., Karlsson, P. G., Eriksson, S. K., Hahlin, M., Siegbahn, H., Rensmo, H., . . . Ahlund, J. (2015). Increased photoelectron transmission in High-pressure photoelectron spectrometers using "swift acceleration". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 785, 191-196
Open this publication in new window or tab >>Increased photoelectron transmission in High-pressure photoelectron spectrometers using "swift acceleration"
Show others...
2015 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 785, p. 191-196Article in journal (Refereed) Published
Abstract [en]

A new operation mode of a HPXPS (high-pressure X-ray photoelectron spectroscopy) analyzer is evaluated on a HPXPS system fitted with an Al K alpha X-ray source. A variety of metal foil samples (gold, silver and copper) were measured in different sample gas environments (N-2 and H2O), and a front aperture diameter of 0.8 mm. The new design concept is based upon "swiftly" accelerating the photoelectrons to kinetic energies of several keV after they pass the analyzer front aperture. Compared to the standard mode, in which the front section between the two first apertures is field-free, this gives a wider angular collection and a lower tendency for electron losses in collisions with gas molecules within the analyzer. With the swift-acceleration mode we attain, depending on the experimental conditions, up to about 3 times higher peak intensities in vacuum and about 10 to 20 times higher peak intensities in the 6-9 mbar regime, depending on kinetic energy. These experimental findings agree well with simulated transmission functions for the analyzer. The new mode of operation enables faster data acquisition than the standard mode of operation, particularly valuable in a home laboratory environment. Further demonstrations of performance are highlighted by measurements of the valence band structure in dye sensitized solar cell photoelectrodes under a 2 mbar H2O atmosphere, a molecularly modified surface of interest in photoelectrochemical devices.

Keywords
High-pressure X-ray photoelectron spectroscopy, Photoelectron spectroscopy, Scientific instrumentation, Spectrometer, Charge particle analyser
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-252668 (URN)10.1016/j.nima.2015.02.047 (DOI)000352815400029 ()
Funder
VINNOVASwedish Research Council, 2012-4721Swedish Research Council, 2012-4681
Available from: 2015-05-26 Created: 2015-05-11 Last updated: 2017-12-04Bibliographically approved
Rensmo, H. & Siegbahn, H. (2015). Photoelectron Spectroscopy for Chemical Analysis. Chimia (Basel), 69(1-2), 22-29
Open this publication in new window or tab >>Photoelectron Spectroscopy for Chemical Analysis
2015 (English)In: Chimia (Basel), ISSN 0009-4293, Vol. 69, no 1-2, p. 22-29Article in journal (Refereed) Published
Abstract [en]

Photoelectron spectroscopy started its modern development in the fifties based on techniques for studies of nuclear decay. Since then, photoelectron spectroscopy has undergone a dramatic expansion of application and is now a prime research tool in basic and applied science. This progress has been largely due to the concomitant development of photon sources, sample handling and electron energy analyzers. The present article describes some of the salient features of modern photoelectron spectroscopy and its applications with particular emphasis on energy relevant issues.

Keywords
Chemical analysis, Photoelectron spectroscopy
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-251856 (URN)10.2533/chimia.2015.22 (DOI)000351257600005 ()
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2015-04-27 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically approved
Jena, N. K., Josefsson, I., Eriksson, S. K., Hagfeldt, A., Siegbahn, H., Björneholm, O., . . . Odelius, M. (2015). Solvent-Dependent Structure of the I-3(-) Ion Derived from Photoelectron Spectroscopy and Ab Initio Molecular Dynamics Simulations. Chemistry - A European Journal, 21(10), 4049-4055
Open this publication in new window or tab >>Solvent-Dependent Structure of the I-3(-) Ion Derived from Photoelectron Spectroscopy and Ab Initio Molecular Dynamics Simulations
Show others...
2015 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 21, no 10, p. 4049-4055Article in journal (Refereed) Published
Abstract [en]

Ab initio molecular dynamics (MD) simulations of the solvation of LiI3 in four different solvents (water, methanol, ethanol, and acetonitrile) are employed to investigate the molecular and electronic structure of the I-3(-) ion in relation to X-ray photoelectron spectroscopy (XPS). Simulations show that hydrogen-bond rearrangement in the solvation shell is coupled to intramolecular bond-length asymmetry in the I-3(-) ion. By a combination of charge analysis and I 4d core-level XPS measurements, the mechanism of the solvent-induced distortions has been studied, and it has been concluded that charge localization mediates intermolecular interactions and intramolecular distortion. The approach involving a synergistic combination of theory and experiment probes the solvent-dependent structure of the I-3(-) ion, and the geometric structure has been correlated with the electronic structure.

Keywords
ab initio calculations, hydrogen bonds, molecular dynamics, photoelectron spectroscopy, solvent effects
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-251438 (URN)10.1002/chem.201405549 (DOI)000350762400027 ()25631177 (PubMedID)
Available from: 2015-04-23 Created: 2015-04-17 Last updated: 2017-12-04Bibliographically approved
Organisations

Search in DiVA

Show all publications