Relativistic R -matrix calculations for electron--alkali-metal-atom scattering: Cs as a test case

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.6349· OSTI ID:7113663

Thumm, U; Norcross, D W ^[1]

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1. Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)

We have reformulated the Dirac {ital R}-matrix method for low-energy electron scattering by (effectively) one-electron, alkali-metal-like systems and developed an independent computer program for this special purpose. A highly accurate and relativistic representation of the target was used to perform a multichannel close-coupling calculation of cross sections for electron scattering. Our results include the negative-ion affinity and elastic, inelastic, and total cross sections for incident electrons with 0 to 2.8 eV kinetic energy. We find that core-polarization and relativistic effects lead to multiplets of very narrow {sup 3}{ital P}{sub {ital J}}, {ital J}=0,1,2 shape resonances: the effect of the induced core polarization on the electron-electron correlation leads to 6{ital s}6{ital p}{sup 3}{ital P}{sub {ital J}}{sup {ital o}} resonances in contrast to previously predicted bound states of Cs{sup {minus}}, and relativistic interactions are responsible for the autoionizing decay of 6{ital p}{sup 2} {sup 3}{ital P}{sub {ital J}} states below the first excitation threshold.

• OSTI ID: 7113663
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:9; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ANIONS
ATOM COLLISIONS
CESIUM
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
INELASTIC SCATTERING
IONS
MATRICES
METALS
R MATRIX
RELATIVISTIC RANGE
SCATTERING
TESTING
VALIDATION