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Structural studies of melting on the picosecond time scale
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
2008 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 10, no 42, 6344-6349 p.Article, review/survey (Refereed) Published
Abstract [en]

Ultrafast structural studies of laser-induced melting have demonstrated that the solid-liquid phase transition can take place on a picosecond time scale in a variety of materials. Experimental studies using ångström wavelength X-rays from the sub-picosecond pulse source at Stanford (now retired) on non-thermal melting of semi-conductors, such as indium antimonide, employed the decay of a single Bragg-peak to measure the time component of the phase transition. These materials were found to start melting within one picosecond after the laser pulse. Recent computer simulations have described the thermal melting of ice induced by an infrared laser pulse. Here it was shown that melting can happen within a few picoseconds, somewhat slower than non-thermal melting in semi-conductors. These computer simulations are compatible with spectroscopy experiments on ice-melting, demonstrating that simulations form a very powerful complement to experiments targeting the process of phase-transitions. Here we present an overview of recent experimental and theoretical studies of melting, as well as new simulations of ice-melting where the effect of the size of the crystal on scattering is studied. Based on simulations of a near-macroscopic crystal, we predict the decay of the most intense Bragg peaks of ice following heating by laser pulse, by modeling the scattering from the melting sample in the simulations.

Place, publisher, year, edition, pages
2008. Vol. 10, no 42, 6344-6349 p.
National Category
Physical Sciences Chemical Sciences Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-121924DOI: 10.1039/b807550fISI: 000260485600001PubMedID: 18972022OAI: oai:DiVA.org:uu-121924DiVA: diva2:306932
Available from: 2010-03-31 Created: 2010-03-31 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Ultrafast Coherent X-ray Diffractive Nanoimaging
Open this publication in new window or tab >>Ultrafast Coherent X-ray Diffractive Nanoimaging
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

X-ray lasers are creating unprecedented research opportunities in physics,chemistry and biology. The peak brightness of these lasers exceeds presentsynchrotrons by 1010, the coherence degeneracy parameters exceedsynchrotrons by 109, and the time resolution is 105 times better. In theduration of a single flash, the beam focused to a micron-sized spot has the samepower density as all the sunlight hitting the Earth, focused to a millimetresquare. Ultrafast coherent X-ray diffractive imaging (CXDI) with X-ray lasers exploitsthese unique properties of X-ray lasers to obtain high-resolution structures fornon-crystalline biological (and other) objects. In such an experiment, thesample is quickly vaporised, but not before sufficient scattered light can berecorded. The continuous diffraction pattern can then be phased and thestructure of a more or less undamaged sample recovered% (speed of light vs. speed of a shock wave).This thesis presents results from the first ultrafast X-ray diffractive imagingexperiments with linear accelerator-driven free-electron lasers and fromoptically-driven table-top X-ray lasers. It also explores the possibility ofinvestigating phase transitions in crystals by X-ray lasers. An important problem with ultrafast CXDI of small samples such as single proteinmolecules is that the signal from a single measurement will be small, requiringsignal enhancement by averaging over multiple equivalent samples. We present anumerical investigation of the problems, including the case where samplemolecules are not exactly identical, and propose tentative solutions. A new software package (Hawk) has been developed for data processing and imagereconstruction. Hawk is the first publicly available software package in thisarea, and it is released as an open source software with the aspiration offostering the development of this field.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 49 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 731
Keyword
XFEL, Phasing, Image Reconstruction, Single Particle Imaging, Ultrafast Diffraction, X-ray diffraction, Coherent Diffractive Imaging, CXDI
Identifiers
urn:nbn:se:uu:diva-122002 (URN)978-91-554-7776-9 (ISBN)
Public defence
2010-05-14, B41, BMC, Husargatan 3, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2010-04-22 Created: 2010-04-05 Last updated: 2010-05-11Bibliographically approved

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Maia, Filipe R. N. C.Caleman, Carl

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