Collisions of fast electrons with helium. I. Various forms of the second Born approximation
- 1 July 1972
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 5 (7) , 1320-1331
- https://doi.org/10.1088/0022-3700/5/7/009
Abstract
Various forms of the second Born approximation are applied to electron collisions with helium in the energy range 200 to 500 eV. In each case all intermediate states up to 31P are included explicitly, and a closure approximation used for higher states, the energy parameter being chosen to fit the total cross section and dispersion relation values for Re f(0) and Imf(0). Calculations are carried out with and without V4 terms, and in a (1,1)-Pade approximation for the 12S to 11S, 21S and 21P transitions. Results are compared with experiment and with those of other calculations. The present results cast doubt upon the practice of normalizing experiment to the first Born approximation at intermediate energies.Keywords
This publication has 22 references indexed in Scilit:
- Infinite-Channel Close-Coupling Theory in the Second Born Approximation. I. Charge Polarization in the Elastic Electron Scattering from H and HePhysical Review A, 1971
- Absolute Measurement of Differential Cross Sections for Electron Scattering in HeliumPhysical Review A, 1970
- Excitation of the helium S levels by hydrogen impactJournal of Physics B: Atomic and Molecular Physics, 1970
- A phase-shift analysis of electron-helium scattering. II. Elastic scattering in the energy interval 100-500 eVJournal of Physics B: Atomic and Molecular Physics, 1970
- Analytical orbital wave functions for the two-electron atomJournal of Physics B: Atomic and Molecular Physics, 1969
- A phase-shift analysis of electron-helium scattering: I - Elastic scattering below the 2S resonanceJournal of Physics B: Atomic and Molecular Physics, 1969
- Scattering of electrons by light atoms above threshold energyIl Nuovo Cimento B (1971-1996), 1969
- Absolute Differential Cross Sections of Elastically Scattered Electrons. I. He, N2, and CO at 500 eVThe Journal of Chemical Physics, 1969
- Accurate first Born approximation cross sections for the excitation of helium by fast electronsJournal of Physics B: Atomic and Molecular Physics, 1969
- Zur Theorie des Durchgangs schneller Korpuskularstrahlen durch MaterieAnnalen der Physik, 1930