Resonances in low-energy positron scattering from Li, Na and K
- 28 November 1989
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 22 (22) , 3763-3774
- https://doi.org/10.1088/0953-4075/22/22/024
Abstract
A number of resonances in the L=0, 1 and 2 channels have been found in close-coupling calculations of positron-alkali collisions. In contrast to the corresponding electron scattering case the s-wave phaseshifts for positrons colliding with Li, Na and K start from a positive multiple of pi rad at zero energy which indicates the existence of true alkali-positron bound states. The widths for the various resonances found in the region of the atomic excitation threshold vary between 0.2 and 130 meV. The inclusion of the electronic 3d orbital is observed to be crucial in order to obtain fully developed resonances below the 'resonant' ns-np threshold.Keywords
This publication has 32 references indexed in Scilit:
- Electron-impact excitation of NaPhysical Review A, 1988
- Positron-lithium scattering using the eigenstate expansion methodJournal of Physics B: Atomic and Molecular Physics, 1987
- Total cross sections foratom±collisionsPhysical Review A, 1987
- CFASYM, a program for the calculation of the asymptotic solutions of the coupled equations of electron collision theoryComputer Physics Communications, 1984
- The Physics of Low-energy Electron-Molecule Collisions: A Guide for the Perplexed and the UninitiatedAustralian Journal of Physics, 1983
- Configuration-interaction-Hylleraas calculations on one-positron atomic systemsJournal of Physics B: Atomic and Molecular Physics, 1976
- Feshbach resonances in positron-hydrogen scatteringPhysical Review A, 1975
- The scattering of electrons by sodium atomsJournal of Physics B: Atomic and Molecular Physics, 1972
- The elastic scattering of low energy positrons by atomic hydrogenProceedings of the Physical Society, 1965
- Electron Scattering from HydrogenPhysical Review B, 1961