Pseudostate effects on positron-helium excitation cross sections at intermediate energies
- 1 January 1982
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 15 (1) , L31-L35
- https://doi.org/10.1088/0022-3700/15/1/007
Abstract
Results of two five-state close-coupling (5CC) calculations of positron excitation of helium (11S to 21S,21P) at energies from 40 to 200 eV are presented and compared with an earlier 3CC calculation. In contrast to the e- case, inclusion of k1P and 41S pseudostates increases the cross sections (by 40% at 60 eV). For the 21P excitation the effect is almost entirely due to the k1P pseudostate. The e+ cross sections are substantially larger than those for e-. Total cross sections are given, but are poor below 100 eV due to neglect of positronium formation.Keywords
This publication has 7 references indexed in Scilit:
- Positron impact excitation of the n=2 levels of hydrogenJournal of Physics B: Atomic and Molecular Physics, 1982
- Unitarisation of the eikonal-Born series method for electron- and positron-atom collisionsJournal of Physics B: Atomic and Molecular Physics, 1981
- Positron collisions with helium at intermediate energiesJournal of Physics B: Atomic and Molecular Physics, 1981
- Measurements of total scattering cross sections for intermediate-energy positrons and electrons colliding with helium, neon, and argonPhysical Review A, 1981
- Electron impact excitation of helium at intermediate energiesJournal of Physics B: Atomic and Molecular Physics, 1981
- Brightness enhancement of slow positron beamsApplied Physics A, 1980
- Inelastic scattering of positrons by helium atoms at intermediate energiesJournal of Physics B: Atomic and Molecular Physics, 1979