Outer-shell photodetachment of the metastable Mg− [core]3s3p2 and Ca− [core]4s4p2 4Pe states
ABSTRACT: We report on calculated outer-shell photodetachment cross sections from the metastable (core)nsnp2 4Pe states in Mg− (n=3) and Ca− (n=4) negative ions in the photon energy range w=0–10 eV. Double-ionization thresholds for Mg II and Ca II as well as doubly excited thresholds of the residual...
- Autores:
-
Sanz Vicario, José Luis
Lindroth, Eva
Restrepo Arango, Ricardo León
Mora Ramos, Miguel Eduardo
Cardona Gómez, Juan Carlos
- Tipo de recurso:
- Article of investigation
- Fecha de publicación:
- 2008
- Institución:
- Universidad de Antioquia
- Repositorio:
- Repositorio UdeA
- Idioma:
- eng
- OAI Identifier:
- oai:bibliotecadigital.udea.edu.co:10495/8390
- Acceso en línea:
- http://hdl.handle.net/10495/8390
- Palabra clave:
- Fotodetección
Electrones
- Rights
- openAccess
- License
- Atribución-NoComercial-SinDerivadas 2.5 Colombia
Summary: | ABSTRACT: We report on calculated outer-shell photodetachment cross sections from the metastable (core)nsnp2 4Pe states in Mg− (n=3) and Ca− (n=4) negative ions in the photon energy range w=0–10 eV. Double-ionization thresholds for Mg II and Ca II as well as doubly excited thresholds of the residual atoms Mg I and Ca I are located within the photon energy range considered and thus doubly and triply excited states of both Mg− and Ca− are reached. We use a complex scaled configuration interaction (CSCI) method for the three active electrons supplemented with a sophisticated model potential as developed by Laughlin (Phys. Scr. 45, 238 (1992)) to account for core-valence interactions. The CI calculations are based on Mg+ and Ca+ one-electron orbitals expanded in terms of B-spline basis set. We compare our cross sections with the only calculation available up to a photon energy 0.25 Ry (w~3.4 eV) (Zeng et al., Phys. Rev. A 62, 022713(2000)) performed by using the R-matrix method, in which only one 4Po resonance for Mg− and two (4Po and 4Do) for Ca− were predicted. In this work, by analyzing both the cross sections and the locations of the S-matrix poles in the complex plane, we are able to predict six 4Po, four 4Do, and four 4So resonant states for Mg−, and three 4Po and two 4Do resonant states in Ca−. |
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