Generalized oscillator strengths for two transitions in CO2 at incident electron energies of 300, 400 and 500 eV |
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Authors: | Kirby N. Klump Edwin N. Lassettre |
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Affiliation: | Department of Chemistry, Carnegie-Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213 U.S.A. |
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Abstract: | Generalized oscillator strengths have been obtained for two transitions in CO2 from inelastic electron scattering determinations as a function of angle. Excitation energies for the two transitions are 11.04 and 11.38 eV, respectively. This spectral region was studied previously by Lassettre and Shiloff1 but at a resolution too low to resolve the two transitions. In the present experiments the two are clearly resolved. Results are compared with the previous experiments of Foo et al.2. Since substantial discrepancies are found both with the previous results of Lassettre and Shiloff and that of Foo et al., the accuracy of angular trends has been checked by comparing elastic scattering with the accurate determinations of Bromberg.6 Agreement is good. Multiple scattering is shown to be absent by varying the pressure. Generalized oscillator strengths are compared with the theoretical calculations of McKoy and collaborators. The change in the shape of the CO2 spectrum in the region of 7–10 eV excitation energy is also studied. |
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