Low-lying {sup 3}P{sup o} and {sup 3}S{sup e} states of Rb{sup -}, Cs{sup -}, and Fr{sup -}

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.61.022722· OSTI ID:20215318

Bahrim, C ^[1]; Thumm, U ^[1]

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1. J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601 (United States)

Our Dirac R-matrix calculations suggest that none of the heavy alkali-metal negative ions, Rb, Cs, and Fr, has an excited bound state. Their lowest excited state appears to be a multiplet of {sup 3}P{sub J}{sup o}-shape resonances, the J=1 component of which was recently observed in photodetachment experiments on Cs{sup -}. We analyze these {sup 3}P{sub J}{sup o} and the {sup 3}S{sup e} excited negative ion states in partial and converged total scattering cross sections for slow electrons with incident kinetic energies below 120 meV. Our results are in excellent agreement with available experimental data. We also propose a new value for the electron affinity of Fr, provide the scattering length for electronic collisions with Rb, Cs, and Fr, and discuss the nuclear charge dependence of relativistic effects in the resonance profiles. (c) 2000 The American Physical Society.

• OSTI ID: 20215318
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 61; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AFFINITY
BOUND STATE
CESIUM
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
EXCITED STATES
EXPERIMENTAL DATA
FRANCIUM
P STATES
R MATRIX
RELATIVITY THEORY
RUBIDIUM
S STATES
THEORETICAL DATA