4-Bromobiphenyl: Long-lived molecular anion formation and competition between electron detachment and dissociation

0511860 - ÚFCH JH 2020 RIV US eng J - Journal Article
Asfandiarov, N. L. - Pshenichnyuk, S. A. - Rakhmeyev, R. G. - Tuktarov, R. F. - Zaitsev, N. L. - Vorob'ev, A. S. - Kočišek, Jaroslav - Fedor, Juraj - Modelli, A.
4-Bromobiphenyl: Long-lived molecular anion formation and competition between electron detachment and dissociation.
Journal of Chemical Physics. Roč. 150, č. 11 (2019), č. článku 114304. ISSN 0021-9606. E-ISSN 1089-7690
R&D Projects: GA ČR GA17-04844S
Institutional support: RVO:61388955
Keywords : attachment * ion * energies * affinity * states * rates
OECD category: Physical chemistry
Impact factor: 2.991, year: 2019
Method of publishing: Open access with time embargo

Electron attachment to the 4-bromobiphenyl molecule and the decay channels of its molecular anion were investigated by means of Dissociative Electron Attachment (DEA) spectroscopy with two different spectrometers. The first apparatus is equipped with a static magnet mass analyzer (Ufa group) and the second one with a quadrupole mass filter (Prague group). The dominant DEA channel at low electron energy leads to formation of Br- negative fragments. Long-lived (tau(a) = 40 mu s at the temperature of 80 X degrees C) molecular negative ions were detected only in the Ufa experiment. We explored the involved potential energy surfaces and found that the molecular anion has two distinct structures with the C-Br distances of 1.92 angstrom and 2.8 angstrom. The statistical model based on the Arrhenius approximation fully explains the experimental observations and sheds light on the earlier anion dissociation kinetic studies in solution. Published under license by AIP Publishing.
Permanent Link: http://hdl.handle.net/11104/0302110