Resonances in e^- + heavy alkali-metal-atom collisions

C. Bahrim, U. Thumm
J.R.Macdonald Laboratory, Kansas State University

Abstract

Based on the relativistic R-matrix method¹ for collisions between slow electrons and Rb or Fr atoms, we provide converged elastic and inelastic scattering cross sections. We include all one-particle relativistic effects and determine valence orbitals in all j-dependent effective core potentials which reproduce the lower part of the neutral alkali spectra. The electrostatic interaction between the two outer electrons is modified by a core-polarization correction which is adjusted to reproduce the experimental electron affinity. Partial cross-sections and eigenphase sums are analyzed to determine both energies and widths of negative ion resonances. Our results are compared with recent experimental results for both Rb^- and Fr^- ions^2,3.

1. U. Thumm and D.W. Norcross, Phys. Rev. A 45, 6349 (1992).
2. S.J. Buckman and C.W. Clark, Rev. Mod. Phys. 66, 539 (1994).
3. A.R. Johnson and P.D. Burrow, Phys. Rev. A 51, 406 (1995).

Supported by the Office of Fusion Energy Sciences, Office of Energy Research, U.S. DOE.

Submitted to the APS Centennial Meeting/DAMOP, Atlanta, GA in March 1999

 

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