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Intermediate energy cross sections for electron-impact vibrational-excitation of pyrimidine
Jones, D. B. Ellis-Gibbings, L. García, G. Nixon, Kate Lopes, M. C. A. Brunger, M. J.
Jones, D. B.
Ellis-Gibbings, L.
García, G.
Nixon, Kate
Lopes, M. C. A.
Brunger, M. J.
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2015-09-07
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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.
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Intermediate energy cross sections for electron-impact vibrational-excitation of pyrimidine 2015, 143 (9):094304 The Journal of Chemical Physics
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Journal article
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en
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0021-9606
1089-7690
1089-7690
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ARC, CNPq, CAPES, MINECO, FAPEMIG and COST