Electron collisions with cyanoacetylene HC3N: Vibrational excitation and dissociative electron attachment

0497637 - ÚFCH JH 2019 RIV US eng J - Journal Article
Ranković, Miloš - Nag, Pamir - Zawadski, M. - Ballauf, L. - Žabka, Ján - Polášek, Miroslav - Kočišek, Jaroslav - Fedor, Juraj
Electron collisions with cyanoacetylene HC3N: Vibrational excitation and dissociative electron attachment.
Physical Review A. Roč. 98, NOV 2018 (2018), č. článku 052708. ISSN 2469-9926. E-ISSN 2469-9934
R&D Projects: GA ČR GA17-04844S; GA ČR(CZ) GA17-14200S
Institutional support: RVO:61388955
Keywords : Electron collisions * Electron energy analyzers * Plasma collision processes
OECD category: Physical chemistry
Impact factor: 2.907, year: 2018

We experimentally probe electron collisions with HC3N in the energy range from 0 to 10 eV with the focus on vibrational excitation and dissociative electron attachment. The vibrational excitation cross sections show a number of resonances which are mode specific: the two dominant π∗ resonances are visible in the excitation of all the vibrational modes. However, broad σ∗ resonances are visible only in certain bond-stretching vibrational modes. The lower π∗ resonance shows a pronounced boomerang structure. Since it overlaps with the threshold peak originating from a long-range electron-molecule interaction, the interference pattern is rather unusual. Somewhat surprisingly, the boomerang structure is visible also in the elastic scattering cross section. The dissociative electron attachment cross sections agree qualitatively with the data of Gilmore and Field [J. Phys. B 48, 035201 (2015)]. However, approximately a factor of two difference is found in the absolute values.
Permanent Link: http://hdl.handle.net/11104/0290178