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Photoionization of excited atomic oxygen: Theory and calculations

Photoionization of excited atomic oxygen: Theory and calculations The variational R -matrix approach for photoionization has been modified in two ways to treat Rydberg excited states of large radius: (1) the large residual contributions to dipole transition and normalization integrals outside the R -matrix radius are treated analytically, and (2) the amplitude of Rydberg functions on the boundary is considered explicitly. Photoionization cross sections as a function of energy are reported for 2 p 4 O ( 3 P) ground-state atomic oxygen and for O + ( 4 S)3p P 3 excited-state oxygen and compared with previous work, where available. The excited-state cross section is in excellent agreement with limited experimental data. A Cooper minimum is predicted in the excited-state partial cross section to the O + ( 4 S)εd continuum. A systematic study of the effect of electronic correlation in the configuration-interaction (CI) expansion of the wave function inside the R matrix is reported. The location of the Cooper minimum is the feature that is most sensitive to the CI representation used. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Photoionization of excited atomic oxygen: Theory and calculations

Physical Review A , Volume 39 (3) – Feb 1, 1989
7 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1989 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.39.1156
Publisher site
See Article on Publisher Site

Abstract

The variational R -matrix approach for photoionization has been modified in two ways to treat Rydberg excited states of large radius: (1) the large residual contributions to dipole transition and normalization integrals outside the R -matrix radius are treated analytically, and (2) the amplitude of Rydberg functions on the boundary is considered explicitly. Photoionization cross sections as a function of energy are reported for 2 p 4 O ( 3 P) ground-state atomic oxygen and for O + ( 4 S)3p P 3 excited-state oxygen and compared with previous work, where available. The excited-state cross section is in excellent agreement with limited experimental data. A Cooper minimum is predicted in the excited-state partial cross section to the O + ( 4 S)εd continuum. A systematic study of the effect of electronic correlation in the configuration-interaction (CI) expansion of the wave function inside the R matrix is reported. The location of the Cooper minimum is the feature that is most sensitive to the CI representation used.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Feb 1, 1989

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