Contrasting Dynamics in Isoelectronic Anions Formed by Electron Attachment

Nag, P.; Ranković, M.; Polášek, M.; Čurík, R.; Slaughter, D. S.; Fedor, J.

doi:10.1021/acs.jpclett.3c03460

Title: Contrasting Dynamics in Isoelectronic Anions Formed by Electron Attachment

Journal Article · Fri Jan 19 00:00:00 EST 2024 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.3c03460· OSTI ID:2281943

^[1]; Ranković, M. ^[1]; Polášek, M. ^[1]; Čurík, R. ^[1];

^[2];

^[1]

J. Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Cyanogen NCCN and cyanoacetylene HCCCN are isoelectronic molecules, and as such, they have many similar properties. We focus on the bond cleavage in these induced by the dissociative electron attachment. In both molecules, resonant electron attachment produces CN^– with very similar energy dependence. We investigate the very different dissociation dynamics, in each of the two molecules, revealed by velocity map imaging of this common fragment. Different dynamics are manifested both in the excess energy partitioning and in the angular distributions of fragments. Based on the comparison with electron energy loss spectra, which provide information about possible parent states of the resonances (both optically allowed and forbidden excited states of the neutral target), we ascribe the observed effect to the distortion of the nuclear frame during the formation of core-excited resonance in cyanoacetylene. The proposed mechanism also explains a puzzling difference in the magnitude of the CN^– cross section in the two molecules which has been so far unexplained.

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Research Organization:: Czech Academy of Sciences (CAS), Prague (Czech Republic). Jaroslav Heyrovsky Institute of Physical Chemistry; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy S; Czech Science Foundation

Grant/Contract Number:: AC02-05CH11231; 21-26601X; 21-12598S; LTC20062

OSTI ID:: 2281943

Alternate ID(s):: OSTI ID: 2283644

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Vol. 15 Journal Issue: 4; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
anions
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electrical energy
molecules
resonance structures

Title: Contrasting Dynamics in Isoelectronic Anions Formed by Electron Attachment

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