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Complete dissociation branching fractions and Coulomb explosion dynamics of SO2 induced by excitation of O 1s pre-edge resonances

Journal article
Authors P. Salen
Vasyl Yatsyna
L. Schio
Raimund Feifel
M. af Ugglas
R. Richter
M. Alagia
S. Stranges
Vitali Zhaunerchyk
Published in Journal of Chemical Physics
Volume 143
Issue 13
Pages Article nr. 134302
ISSN 0021-9606
Publication year 2015
Published at Department of Physics (GU)
Pages Article nr. 134302
Language en
Keywords absolute oscillator-strengths, triple coincidence technique, kinetic-energy release, 2s inner shells, sulfur-dioxide, ionic, photofragmentation, double photoionization, asymmetry parameters, 2p, photoexcitation, double-ionization, Physics
Subject categories Physical Sciences


Fragmentation processes of SO2 following excitation of the six main O 1s pre-edge resonances, as well as above the ionization threshold and below the resonances, are studied using a position-sensitive time-of-flight ion imaging detector, and the associated dissociation branching ratios and break-up dynamics are determined. In order to distinguish between the O+ and S2+ fragments of equal mass-to-charge ratio, the measurements have been performed with the isotopically enriched (SO2)-O-18 sample. By analysis of the complete set of the fragment momentum vectors, the beta values for the fragments originating from the SO+ + O+ break-up and the kinetic energy release for fragmentation channels of both SO22+ and SO23+ parent ions are determined. We also present results on the three-body break-up dynamics. (C) 2015 AIP Publishing LLC.

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