Dissociative electron attachment to carbon tetrachloride probed by velocity map imaging

Paul, Anirban; Nandi, Dhananjay; Slaughter, Daniel S.; Fedor, Juraj; Nag, Pamir

doi:10.1039/D3CP04834A

Title: Dissociative electron attachment to carbon tetrachloride probed by velocity map imaging

Journal Article · Wed Feb 14 00:00:00 EST 2024 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/D3CP04834A· OSTI ID:2281638

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Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India, Center for Atomic, Molecular and Optical Sciences & Technologies, Joint Initiative of IIT Tirupati & IISER Tirupati, Yerpedu, 517619, Andhra Pradesh, India
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, 182 23, Dolejškova 2155/3, Prague, Czech Republic

Bond-breaking in CCl₄via dissociative electron attachment (DEA) has been studied using a velocity map imaging (VMI) spectrometer. A number of effects related to the dissociation dynamics have been revealed. The near-zero eV s-wave electron attachment, which leads to the production of Cl^- anions, is accompanied by a very efficient intramolecular vibrational redistribution. This is manifested by a small fraction of the excess energy being released in the form of the fragments' translation energy. A similar effect is observed for higher-lying electronic resonances with one exception: the resonance centered around 6.2 eV leads to the production of fast Cl₂^- fragments and their angular distribution is forward peaking. This behavior could not be explained with a single-electronic-state model in the axial recoil approximation and is most probably caused by bending dynamics initiated by a Jahn–Teller distortion of the transient anion. The CCl₂^- fragment has a reverse backward-peaking angular distribution, suggesting the presence of a long-distance electron hopping mechanism between the fragments.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Ministry of Education, Youth and Sports of the Czech Republic

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2281638

Alternate ID(s):: OSTI ID: 2337818

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Vol. 26 Journal Issue: 7; ISSN 1463-9076

Publisher:: Royal Society of Chemistry (RSC)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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