Exploring the ultrafast and isomer-dependent photodissociation of iodothiophenes via site-selective ionization

Coulomb explosion Photoexcitation Extreme ultraviolet
DOI: 10.1039/d3cp06079a Publication Date: 2024-04-05T09:20:50Z
ABSTRACT
C-I bond extension and fission following ultraviolet (UV, 262 nm) photoexcitation of 2- 3-iodothiophene is studied using ultrafast time-resolved extreme (XUV) ionization in conjunction with velocity map ion imaging. The photoexcited molecules eventual I atom products are probed by site-selective at the 4d edge intense XUV pulses, which induce multiple charges initially localized to iodine atom. At separations below critical distance for charge transfer (CT), can redistribute around molecule leading Coulomb explosion charged fragments high kinetic energy. greater separations, beyond distance, CT no longer possible measured energies atoms report on neutral dissociation process. time momentum resolved measurements allow determination timescales respective product energy distributions both isomers, interpreted terms rival 'direct' 'indirect' pathways. compared a classical over barrier model, reveals that onset indirect process delayed ∼1 ps relative direct kinetics two processes show discernible difference between parent but branching channels isomer dependencies. yield from nm photolysis (
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