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

Darryl Jones, L. Ellis-Gibbings, Garcia G, K Nixon, M Lopes, Michael Brunger

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    10 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number094304
    Pages (from-to)094304-1-094304-7
    Number of pages7
    JournalJournal of Chemical Physics
    Volume143
    Issue number9
    DOIs
    Publication statusPublished - 20 Aug 2015

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