Near-threshold photodetachment of heavy alkali-metal anions

Journal Article · Thu Oct 31 23:00:00 EST 2002 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.66.052712· OSTI ID:20632302

Bahrim, C; Thumm, U; Khuskivadze, A A; Fabrikant, I I ^[1]

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1. Department of Physics, Kansas State University, Manhattan, Kansas 66506-2604 (United States)

We calculate near-threshold photodetachment cross sections for Rb{sup -}, Cs{sup -}, and Fr{sup -} using the Pauli equation method with a model potential describing the effective electron-atom interaction. Parameters of the model potential are fitted to reproduce ab initio scattering phase shifts obtained from Dirac R-matrix calculations. Special care is taken to formulate the boundary conditions near the atomic nucleus for solving the Pauli equation, based on the analytic solution of the Dirac equation for a Coulomb potential. We find a {sup 3}P{sub 1}{sup o} resonance contribution to the photodetachment cross section of Rb{sup -}, Cs{sup -}, and Fr{sup -} ions. Our calculated total photodetachment cross sections for Cs agree with experiments after tuning the resonance position by 2.4 meV. For Rb{sup -} and Fr{sup -} the resonance contribution is much smaller than for Cs. We therefore also provide angle-differential cross sections and asymmetry parameters which are much more sensitive to the resonant contribution than total cross sections.

• OSTI ID: 20632302
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 66; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ANALYTICAL SOLUTION
ANIONS
ASYMMETRY
BOUNDARY CONDITIONS
CESIUM IONS
CORRECTIONS
COULOMB FIELD
DIFFERENTIAL CROSS SECTIONS
DIRAC EQUATION
ELECTRON DETACHMENT
ELECTRON-ATOM COLLISIONS
FRANCIUM IONS
MEV RANGE
PHASE SHIFT
POTENTIAL ENERGY
POTENTIALS
R MATRIX
RELATIVISTIC RANGE
RESONANCE
RUBIDIUM IONS
SCATTERING
TOTAL CROSS SECTIONS