Distinguishing the XUV-induced Coulomb explosion dynamics of iodobenzene using covariance analysis

Walmsley, Tiffany; Allum, Felix; Harries, James R.; Kumagai, Yoshiaki; Lim, Suzanne; McManus, Joseph; Nagaya, Kiyonobu; Britton, Mathew; Brouard, Mark; Bucksbaum, Philip; Fushitani, Mizuho; Gabalski, Ian; Gejo, Tatsuo; Hockett, Paul; Howard, Andrew J.; Iwayama, Hiroshi; Kukk, Edwin; Lam, Chow-shing; Minns, Russell S.; Niozu, Akinobu; Nishimuro, Sekito; Niskanen, Johannes; Owada, Shigeki; Razmus, Weronika O.; Rolles, Daniel; Somper, James; Ueda, Kiyoshi; Unwin, James; Wada, Shin-ichi; Woodhouse, Joanne L.; Forbes, Ruaridh; Burt, Michael; Warne, Emily M.

doi:10.1088/1361-6455/ad8799

Title: Distinguishing the XUV-induced Coulomb explosion dynamics of iodobenzene using covariance analysis

Journal Article · 25 October 2024 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI: https://doi.org/10.1088/1361-6455/ad8799 · OSTI ID:2474519

;

; Harries, James R.;

; Lim, Suzanne; McManus, Joseph; Nagaya, Kiyonobu; Britton, Mathew;

; Bucksbaum, Philip;

;

; Kukk, Edwin;

;

Abstract The primary and secondary fragmentation dynamics of iodobenzene following its ionization at 120 eV were determined using three-dimensional velocity map imaging and covariance analysis. Site-selective iodine 4d ionization was used to populate a range of excited polycationic parent states, which primarily broke apart at the carbon-iodine bond to produce I ⁺ with phenyl or phenyl-like cations (C _n H ${_{x}}^{+}$ or C _n H ${_{x}}^{2 +}$ , with n = 1 – 6 and x = 1 – 5). The molecular products were produced with varying degrees of internal excitation and dehydrogenation, leading to stable and unstable outcomes. This further allowed the secondary dynamics of $C_{6} H_{x}^{2 +}$ intermediates to be distinguished using native-frame covariance analysis, which isolated these processes in their own centre-of-mass reference frames. The mass resolution of the imaging mass spectrometer used for these measurements enabled the primary and secondary reaction channels to be specified at the level of individual hydrogen atoms, demonstrating the ability of covariance analysis to comprehensively measure the competing fragmentation channels of aryl cations, including those involving intermediate steps.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2474519

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 23 Vol. 57; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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