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@ARTICLE{Allum:643549,
author = {Allum, Felix and Kumagai, Yoshiaki and Nagaya, Kiyonobu and
Harries, James R. and Iwayama, Hiroshi and Britton, Mathew
and Bucksbaum, Philip H. and Burt, Michael and Brouard, Mark
and Downes-Ward, Briony and Driver, Taran and Heathcote,
David and Hockett, Paul and Howard, Andrew J. and Lee, Jason
Wai Lung and Liu, Yusong and Kukk, Edwin and McManus, Joseph
W. and Milešević, Dennis and Minns, Russell S. and Niozu,
Akinobu and Niskanen, Johannes and Orr-Ewing, Andrew J. and
Owada, Shigeki and Robertson, Patrick and Rolles, Daniel and
Rudenko, Artem and Ueda, Kiyoshi and Unwin, James and
Vallance, Claire and Walmsley, Tiffany and Ashfold, Michael
N. R. and Forbes, Ruaridh},
title = {{T}ime-resolved momentum imaging of {UV} photodynamics in
structural isomers of iodopropane probed by site-selective
{XUV} ionization},
journal = {Physical chemistry, chemical physics},
volume = {27},
number = {38},
issn = {1463-9076},
address = {Cambridge},
publisher = {RSC Publ.},
reportid = {PUBDB-2026-00279},
pages = {20602 - 20613},
year = {2025},
note = {Waiting for fulltext},
abstract = {The photodynamics of 1- and 2-iodopropane (1 and 2-IP) were
studied in a time-resolved scheme incorporating ultraviolet
(UV) excitation and extreme ultraviolet (XUV) probing, which
initiates photoionization selectively from the I 4d core
orbital. UV absorption in the A-band of both isomers leads
to prompt C–I bond fission, with significant disposal of
internal energy into the propyl radical product.
Site-selective ionization enables a range of charge transfer
(CT) processes between the nascent highly charged iodine
ions and neutral propyl radicals, dependent on the
interfragment distance at the instant of ionization. Subtle
differences in the dynamics of these CT processes between
the two isomers are observed. In 1-IP, the kinetic energies
of iodine ions produced by UV photodissociation and
subsequent XUV multiple ionization increased notably over
the first few hundred femtoseconds, which could be
understood in terms of differing gradients along the
photodissociation coordinates of the neutral and
polycationic states involved in the pump and probe steps,
respectively. Led by a recent report of HI elimination in UV
photoexcited 2-IP [Todt et al., Phys. Chem. Chem. Phys.,
22(46), 27338 (2020)], we also model the most likely
signatures of this process in the present experiment, and
can identify signal in the 2-IP data (that is absent or
significantly weaker in the data from the unbranched 1-IP
isomer) that is consistent with such a process occurring on
ultrafast timescales.},
cin = {CFEL-UDSS},
ddc = {540},
cid = {I:(DE-H253)CFEL-UDSS-20160914},
pnm = {631 - Matter – Dynamics, Mechanisms and Control
(POF4-631)},
pid = {G:(DE-HGF)POF4-631},
experiment = {EXP:(DE-MLZ)External-20140101},
typ = {PUB:(DE-HGF)16},
doi = {10.1039/D5CP02929E},
url = {https://bib-pubdb1.desy.de/record/643549},
}