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Comparison of x-ray absorption spectra between water and ice: New ice data with low pre-edge absorption cross-section
Stockholm University, Faculty of Science, Department of Physics. SLAC National Accelerator Laboratory, USA.ORCID iD: 0000-0003-2793-5052
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2014 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 141, no 3, 034507- p.Article in journal (Refereed) Published
Abstract [en]

The effect of crystal growth conditions on the O K-edge x-ray absorption spectra of ice is investigated through detailed analysis of the spectral features. The amount of ice defects is found to be minimized on hydrophobic surfaces, such as BaF2(111), with low concentration of nucleation centers. This is manifested through a reduction of the absorption cross-section at 535 eV, which is associated with distorted hydrogen bonds. Furthermore, a connection is made between the observed increase in spectral intensity between 544 and 548 eV and high-symmetry points in the electronic band structure, suggesting a more extended hydrogen-bond network as compared to ices prepared differently. The spectral differences for various ice preparations are compared to the temperature dependence of spectra of liquid water upon supercooling. A double-peak feature in the absorption cross-section between 540 and 543 eV is identified as a characteristic of the crystalline phase. The connection to the interpretation of the liquid phase O K-edge x-ray absorption spectrum is extensively discussed.

Place, publisher, year, edition, pages
2014. Vol. 141, no 3, 034507- p.
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Physical Sciences
URN: urn:nbn:se:su:diva-107632DOI: 10.1063/1.4890035ISI: 000340711300033OAI: diva2:748953


Available from: 2014-09-22 Created: 2014-09-22 Last updated: 2014-09-22Bibliographically approved

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Sellberg, Jonas A.Pettersson, Lars G. M.Nilsson, Anders
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