Interaction of an alkaline-earth atom with an electron: scattering, negative ion and photodetachment
- 28 December 1990
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 23 (24) , 4505-4519
- https://doi.org/10.1088/0953-4075/23/24/010
Abstract
Three mutually related problems concerning the interaction of an electron with an alkaline-earth atom are examined. (i) The scattering problem: the phaseshifts for p-electron scattering by Ca, Sr and Ba are calculated. (ii) The negative ion problem: the wavefunction and the binding energy are obtained for the outer electron in Ca- 4s24p, Sr- 5s25p and Ba- 6s26p ions. (iii) The photodetachment problem: the photodetachment cross sections are calculated for the outer electron in each of these ions. The most intriguing feature of these problems is the strong correlational potential, attracting the electron to the atom due to the large dipole polarizabilities of Ca, Sr and Ba. The calculations are performed by means of the Dyson equation of the many-body theory.Keywords
This publication has 13 references indexed in Scilit:
- Many-body theory applied to negative ionsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Stable negative ions of the heavy alkaline-earth atomsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- On the calculation of electron-atom collision properties using exterior complex dilatated S- matrix expansionsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Binding energies forpelectrons in negative alkaline-earth elementsPhysical Review A, 1989
- Many-body calculation of negative ions using the Dyson equationJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Ground states ofandfrom two theoretical points of viewPhysical Review Letters, 1987
- Binding Energies in Atomic Negative Ions: IIJournal of Physical and Chemical Reference Data, 1985
- Slow-electron elastic scattering on argonPhysical Review A, 1982
- Theoretical photodetachment cross section forPhysical Review A, 1981
- Low-energy electron scattering from Mg, Zn, Cd and Hg: shape resonances and electron affinitiesJournal of Physics B: Atomic and Molecular Physics, 1976