Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules: A candidate system for time-resolved dynamics

Mandal, S. and Sharma, V. et al (2021) Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules: A candidate system for time-resolved dynamics. Faraday Discussions, 228. pp. 242-265. ISSN 13596640

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Abstract

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.

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IITH Creators:

IITH Creators	ORCiD
Sharma, Vandana	ttps://orcid.org/0000-0001-9830-2485

Item Type:

Article

Uncontrolled Keywords:

Acetylene molecules, Extreme ultraviolets, Isomerization channels, Photoelectron energy spectra, Photoelectron-photoion coincidence, Photon energy range, Time-resolved dynamics, Velocity map imaging

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Mrs Haseena VKKM

Date Deposited:

24 Nov 2021 09:01

Last Modified:

04 Mar 2022 09:17

URI:

http://raiithold.iith.ac.in/id/eprint/9009