Relativistic R -matrix calculations for electron--alkali-metal-atom scattering: Cs as a test case
- 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), Vol. 45:9; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKALI METALS
ELECTRON-ATOM COLLISIONS
ANIONS
CESIUM
CROSS SECTIONS
ELASTIC SCATTERING
EXCITED STATES
INELASTIC SCATTERING
R MATRIX
RELATIVISTIC RANGE
VALIDATION
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
IONS
MATRICES
METALS
SCATTERING
TESTING
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)