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Intermediate energy cross sections for electron-impact vibrational-excitation of pyrimidine

AuthorsJones, D.B.; Ellis-Gibbings, L. ; García, Gustavo ; Nixon, K.L.; Lopes, M.C.A.; Brunger, M.J.
Issue Date4-Sep-2015
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 143: 094304 (2015)
Abstract© 2015 AIP Publishing LLC. We report differential cross sections (DCSs) and integral cross sections (ICSs) for electron-impact vibrational-excitation of pyrimidine, at incident electron energies in the range 15-50 eV. The scattered electron angular range for the DCS measurements was 15°-90°. The measurements at the DCS-level are the first to be reported for vibrational-excitation in pyrimidine via electron impact, while for the ICS we extend the results from the only previous condensed-phase study [P. L. Levesque, M. Michaud, and L. Sanche, J. Chem. Phys. 122, 094701 (2005)], for electron energies <12 eV, to higher energies. Interestingly, the trend in the magnitude of the lower energy condensed-phase ICSs is much smaller when compared to the corresponding gas phase results. As there is no evidence for the existence of any shape-resonances, in the available pyrimidine total cross sections [Baek et al., Phys. Rev. A 88, 032702 (2013); Fuss et al., ibid. 88, 042702 (2013)], between 10 and 20 eV, this mismatch in absolute magnitude between the condensed-phase and gas-phase ICSs might be indicative for collective-behaviour effects in the condensed-phase results.
Description7 págs.; 3 figs.; 5 tabs.
Publisher version (URL)http://dx.doi.org/10.1063/1.4929907
Identifiersdoi: 10.1063/1.4929907
issn: 0021-9606
Appears in Collections:(CFMAC-IFF) Artículos
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