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Title: All-XUV Pump-Probe Transient Absorption Spectroscopy of the Structural Molecular Dynamics of Di-iodomethane

Journal Article · · Physical Review. X
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In this work, we use an extreme-ultraviolet (XUV) free-electron laser (FEL) to resonantly excite the I : 4 d 5 / 2 σ * transition of a gas-phase di-iodomethane ( CH 2 I 2 ) target. This site-specific excitation generates a 4 d core hole located at an iodine site, which leaves the molecule in a well-defined excited state. We subsequently measure the time-dependent absorption change of the molecule with the FEL probe spectrum centered on the same I : 4 d resonance. Using ab initio calculations of absorption spectra of a transient isomerization pathway observed in earlier studies, our time-resolved measurements allow us to assign the timescales of the previously reported direct and indirect dissociation pathways. The presented method is thus sensitive to excited-state molecular geometries in a time-resolved manner, following a core-resonant site-specific trigger.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; European Research Council (ERC); Ministry of Education, Singapore; German Research Foundation (DFG); National Science Foundation (NSF); German Federal Ministry of Education and Research (BMBF)
Grant/Contract Number:
AC02-05CH11231; X-MuSiC-616783; RG105/17; RG1/20; CHE-1660417; 05K13PM2
OSTI ID:
1804940
Alternate ID(s):
OSTI ID: 1813423; OSTI ID: 1814507
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 11 Journal Issue: 3; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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