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Journal Articles Journal of Physics B: Atomic, Molecular and Optical Physics Year : 2022

UV-induced dissociation of CH2BrI probed by intense femtosecond XUV pulses

Jason Lee
Felix Allum
  • Function : Author
Kasra Amini
Sadia Bari
Mark Brouard
Michael Burt
Per Eng-Johnsson
Benjamin Erk
David Holland
Jan Lahl
Stuart Mackenzie
Sylvain Maclot
Terence Mullins
Claire Vallance
Daniel Rolles
Rebecca Boll

Abstract

The ultraviolet (UV)-induced dissociation and photofragmentation of gas-phase CH2BrI molecules induced by intense femtosecond extreme ultraviolet (XUV) pulses at three different photon energies are studied by multi-mass ion imaging. Using a UV-pump–XUV-probe scheme, charge transfer between highly charged iodine ions and neutral CH2Br radicals produced by C–I bond cleavage is investigated. In earlier charge-transfer studies, the center of mass of the molecules was located along the axis of the bond cleaved by the pump pulse. In the present case of CH2BrI, this is not the case, thus inducing a rotation of the fragment. We discuss the influence of the rotation on the charge transfer process using a classical over-the-barrier model. Our modeling suggests that, despite the fact that the dissociation is slower due to the rotational excitation, the critical interatomic distance for charge transfer is reached faster. Furthermore, we suggest that charge transfer during molecular fragmentation may be modulated in a complex way.
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Origin : Publication funded by an institution

Dates and versions

hal-03797396 , version 1 (05-10-2022)

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Hansjochen Köckert, Jason Lee, Felix Allum, Kasra Amini, Sadia Bari, et al.. UV-induced dissociation of CH2BrI probed by intense femtosecond XUV pulses. Journal of Physics B: Atomic, Molecular and Optical Physics, 2022, 55 (1), pp.014001. ⟨10.1088/1361-6455/ac489d⟩. ⟨hal-03797396⟩
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