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Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules: A candidate system for time-resolved dynamics
S. Mandal, R. Gopal, H. Srinivas, A. D'Elia, A. Sen, S. Sen, R. Richter, M. Coreno, B. Bapat, M. MudrichShow More
Published in Royal Society of Chemistry
PMID: 33687396
Volume: 228
Pages: 242 - 265
The acetylene-vinylidene system serves as a benchmark for investigations of ultrafast dynamical processes where the coupling of the electronic and nuclear degrees of freedom provides a fertile playground to explore the femto- and sub-femto-second physics with coherent extreme-ultraviolet (EUV) photon sources both on the table-top as well as free-electron lasers. We focus on detailed investigations of this molecular system in the photon energy range 19-40 eV where EUV pulses can probe the dynamics effectively. We employ photoelectron-photoion coincidence (PEPICO) spectroscopy to uncover hitherto unrevealed aspects of this system. In this work, the role of excited states of the C2H2+ cation, the primary photoion, is specifically addressed. From photoelectron energy spectra and angular distributions, the nature of the dissociation and isomerization channels is discerned. Exploiting the 4π-collection geometry of the velocity map imaging spectrometer, we not only probe pathways where the efficiency of photoionization is inherently high but also perform PEPICO spectroscopy on relatively weak channels. © 2021 The Royal Society of Chemistry.
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PublisherData powered by TypesetRoyal Society of Chemistry