Destruction of fast metastable hydrogen atoms passing through atomic helium
- 1 July 1973
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 6 (7) , 1237-1245
- https://doi.org/10.1088/0022-3700/6/7/017
Abstract
The first Born approximation is used to calculate cross sections for excitation or de-excitation to discrete states from fast metastable hydrogen atoms passing through atomic helium. Full account is taken of double transitions and the calculations are performed using length and velocity formulation values of the Born helium matrix elements. Close coupling values in the impact parameter theory for the specific transitions 2s to nl(nl=1s, 2p, 3s, 3p) in hydrogen with the target helium atom unexcited indicate that coupling to excited states and to the hydrogen continuum is not important for these particular destruction processes for impact energies greater than 10 keV. Addition of the present Born approximation results to those of Bell and Kingston (1971) for the electron loss contribution provide total destruction cross sections which are a factor of about 2.5 lower than the experimental data (5-30 keV) of Gilbody et al (1971). For electron loss, the recent data of Hughes and Choe suggests that the first Born approximation may be satisfactory for impact energies greater than 100 keV.Keywords
This publication has 14 references indexed in Scilit:
- Charge-Changing Collisions by 20- to 120-keVH(2s)-Atom Impact onN2, Ar, and HePhysical Review A, 1972
- Electron loss from fast metastable hydrogen atoms passing through atomic hydrogen and heliumJournal of Physics B: Atomic and Molecular Physics, 1971
- Collision destruction of fast metastable hydrogen atomsJournal of Physics B: Atomic and Molecular Physics, 1971
- Electron scattering by atomic hydrogen using a pseudostate expansion. III. Excitation of 2s and 2p states at intermediate energiesJournal of Physics B: Atomic and Molecular Physics, 1970
- Multi-state impact-parameter treatment of hydrogen-helium excitation collisionsJournal of Physics B: Atomic and Molecular Physics, 1969
- First Born approximation cross sections for electron loss from fast hydrogen atoms passing through atomic helium and fast helium atoms passing through atomic hydrogen and heliumJournal of Physics B: Atomic and Molecular Physics, 1969
- Accurate first Born approximation cross sections for the excitation of helium by fast electronsJournal of Physics B: Atomic and Molecular Physics, 1969
- Electron Excitation of Atomic Hydrogen in the 2s StateProceedings of the Physical Society, 1958
- Inelastic Collisions between Heavy Particles II: Contributions of Double-Transitions to the Cross Sections associated with the Excitation of Hydrogen Atoms in Fast Encounters with other Hydrogen AtomsProceedings of the Physical Society. Section A, 1954
- A Discussion of Analytic and Hartree-Fock Wave Functions forConfigurations fromto C vPhysical Review B, 1954