Electron-impact ionization cross section of rubidium
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Institute of Physics and Computer Science, Cracow Pedagogical University, 30-084 Krakow (Poland)
- Institute of Physics, Jagellonian University, 30-059 Krakow (Poland)
A theoretical model for electron-impact ionization cross section has been applied to Rb and the theoretical cross section (from the threshold to 1 keV in incident energy) is in good agreement with the recent experimental data obtained using Rb atoms trapped in a magneto-optical trap. The theoretical model, called the binary-encounter{endash}dipole (BED) model, combines a modified Mott cross section with the high-energy behavior of Born cross sections. To obtain the continuum dipole oscillator strength df/dE of the 5s electron required in the BED model, we used Dirac-Fock continuum wave functions with a core polarization potential that reproduced the known position of the Cooper minimum in the photoionization cross section. For inner-shell ionization, we used a simpler version of df/dE, which retained the hydrogenic shape. The contributions of the 4p{r_arrow}4d, 5s, and 5p autoionizing excitations were estimated using the plane-wave Born approximation. As a by-product, we also present the dipole oscillator strengths for the 5s{r_arrow}np{sub 1/2} and 5s{r_arrow}np{sub 3/2} transitions for high principal quantum numbers n near the ionization threshold obtained from the Dirac-Fock wave functions with the same core polarization potential as that used for the continuum wave functions. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 565837
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 57; ISSN PLRAAN; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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