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000643549 1001_ $$0P:(DE-H253)PIP1032123$$aAllum, Felix$$b0$$eCorresponding author
000643549 245__ $$aTime-resolved momentum imaging of UV photodynamics in structural isomers of iodopropane probed by site-selective XUV ionization
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000643549 520__ $$aThe 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.
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000643549 7001_ $$aKumagai, Yoshiaki$$b1
000643549 7001_ $$aNagaya, Kiyonobu$$b2
000643549 7001_ $$aHarries, James R.$$b3
000643549 7001_ $$aIwayama, Hiroshi$$b4
000643549 7001_ $$aBritton, Mathew$$b5
000643549 7001_ $$aBucksbaum, Philip H.$$b6
000643549 7001_ $$aBurt, Michael$$b7
000643549 7001_ $$aBrouard, Mark$$b8
000643549 7001_ $$aDownes-Ward, Briony$$b9
000643549 7001_ $$aDriver, Taran$$b10
000643549 7001_ $$aHeathcote, David$$b11
000643549 7001_ $$aHockett, Paul$$b12
000643549 7001_ $$aHoward, Andrew J.$$b13
000643549 7001_ $$0P:(DE-H253)PIP1027857$$aLee, Jason Wai Lung$$b14
000643549 7001_ $$aLiu, Yusong$$b15
000643549 7001_ $$aKukk, Edwin$$b16
000643549 7001_ $$aMcManus, Joseph W.$$b17
000643549 7001_ $$aMilešević, Dennis$$b18
000643549 7001_ $$aMinns, Russell S.$$b19
000643549 7001_ $$00000-0002-7292-5630$$aNiozu, Akinobu$$b20
000643549 7001_ $$aNiskanen, Johannes$$b21
000643549 7001_ $$aOrr-Ewing, Andrew J.$$b22
000643549 7001_ $$aOwada, Shigeki$$b23
000643549 7001_ $$aRobertson, Patrick$$b24
000643549 7001_ $$0P:(DE-H253)PIP1007320$$aRolles, Daniel$$b25
000643549 7001_ $$aRudenko, Artem$$b26
000643549 7001_ $$aUeda, Kiyoshi$$b27
000643549 7001_ $$aUnwin, James$$b28
000643549 7001_ $$aVallance, Claire$$b29
000643549 7001_ $$aWalmsley, Tiffany$$b30
000643549 7001_ $$aAshfold, Michael N. R.$$b31
000643549 7001_ $$0P:(DE-H253)PIP1088346$$aForbes, Ruaridh$$b32$$eCorresponding author
000643549 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/D5CP02929E$$gVol. 27, no. 38, p. 20602 - 20613$$n38$$p20602 - 20613$$tPhysical chemistry, chemical physics$$v27$$x1463-9076$$y2025
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