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Type: Artigo de periódico
Title: Photoexcitation And Ionization In Carbon Dioxide: Theoretical Studies In The Separated-channel Static-exchange Approximation
Author: Padial N.
Csanak G.
McKoy B.V.
Langhoff P.W.
Abstract: Theoretical studies are reported of total and partial-channel photoexcitation and ionization cross sections in carbon dioxide. As in previously reported studies of discrete and continuum dipole spectra in diatomic (N2, CO, O2, F2) and polyatomic (H2O, H2CO, O3) molecules in this series, separated-channel static-exchange calculations of vertical-electronic transition energies and oscillator strengths and Stieltjes-Tchebycheff moment methods are employed in the development. Detailed comparisons are made of the static-exchange excitation and ionization spectra with photoabsorption, electron-impact excitation, and quantum-defect estimates of discrete transition energies and intensities, and with partial-channel photoionization cross sections obtained from fluorescence measurements and from tunable-source and (e,2e) photoelectron spectroscopy. The spectral characteristics of the various discrete series and continua are interpreted in terms of contributions from compact 2u(*), 5g(*), and 4u(*) virtual valence orbitals, and from more diffuse discrete and continuum Rydberg orbitals. The 2u(*) orbital is found to contribute to discrete excitation series, whereas the 5g (*) and 4u (*) orbitals generally appear in the photoionization continua as resonancelike diabatic valence features. Good agreement obtains between the calculated discrete excitation series and the results of a recent analysis of the available spectroscopic data. The calculated outer-valence-shell (1g-1)Xg2, (1u-1)A u2, (3u-1)B u+2, and (4g-1)C g+2 partial-channel photoionization cross sections are in good accord with measured values, and clarify completely the origins of the various structures in the observed spectra. There is evidence, however, of coupling among scattering states associated with 1g-1 and 1u-1 ionic channels, giving rise to moderate disagreement with tunable-source photoelectron and fluorescence measurements over a portion of the spectrum. In the inner-valence-shell region, the calculated 2u-1 and 3g-1 cross sections are in qualitative accord with the observed many-electron spectral intensities, and provide a basis for quantitative interpretation when combined with appropriate intensity-borrowing calculations. The calculated carbon and oxygen K-edge cross sections are in good agreement with available cross sections obtained from electron-impact and photoabsorption measurements. It is of particular interest to find the oxygen K-edge (1g-1, 1u-1) cross section exhibits both the expected 5g(*) and 4u(*) resonancelike features. Finally, comparisons are made throughout of the discrete and continuum spectra in carbon dioxide with the results of previously reported studies in CO and O2, and the origins of the similarities and differences in the cross sections in these cases are clarified. © 1981 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevA.23.218
Date Issue: 1981
Appears in Collections:Unicamp - Artigos e Outros Documentos

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