title: Electron excitation of the Schumann-Runge continuum, longest band, and second band electronic states in O2.
abstract: We report measurements of differential and integral cross sections for electron excitation of the Schumann-Runge continuum, longest band, and second band electronic states in molecular oxygen. The energy range of the present study is 15-200 eV, with the angular range of the differential cross section (DCS) measurements from 2 to 130°. A generalized oscillator strength analysis is then employed in order to derive integral cross sections (ICSs) from the corresponding DCSs, and these ICSs are compared with relevant energy and oscillator strength scaled Born cross section (BEf-scaling [Y.-K. Kim, J. Chem. Phys. 126, 064305 (2007)]) results determined as a part of this investigation. Interestingly, while the present Schumann-Runge continuum and second band ICSs were in reasonable agreement with the respective BEf-scaling results, agreement for the longest band was poor below 100 eV with a possible reason for this apparently anomalous behavior being canvassed here. Finally, where possible all present data are compared with the results from earlier measurements and calculations with the level of agreement found being very good in some cases and marginal in others.
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Suzuki
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Kato
authors.forename: Mizuha
authors.initials: M
authors.lastname: Ohkawa
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Anzai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Paulo
authors.initials: P
authors.lastname: Limão-Vieira
authors.forename: Laurence
authors.initials: L
authors.lastname: Campbell
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Brunger
mesh_terms: D004583:Electrons; D010100:Oxygen / Q000737:chemistry*; D046590:Spectroscopy, Electron Energy-Loss
chemical_list: D010100:Oxygen