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Titolo:
ELECTRON-IMPACT IONIZATION CROSS-SECTION OF RUBIDIUM
Autore:
KIM YK; MIGDALEK J; SIEGEL W; BIERON J;
Indirizzi:
NATL INST STAND & TECHNOL GAITHERSBURG MD 20899 CRACOW PEDAG UNIV,INST PHYS & COMP SCI PL-30084 KRAKOW POLAND JAGIELLONIAN UNIV,INST PHYS PL-30059 KRAKOW POLAND
Titolo Testata:
Physical review. A
fascicolo: 1, volume: 57, anno: 1998,
pagine: 246 - 254
SICI:
1050-2947(1998)57:1<246:EICOR>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATOMS; PHOTOABSORPTION; COLLISIONS; MOLECULES; DIPOLE; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
Y.K. Kim et al., "ELECTRON-IMPACT IONIZATION CROSS-SECTION OF RUBIDIUM", Physical review. A, 57(1), 1998, pp. 246-254

Abstract

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-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 usedDirac-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-->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-->np(1/2) and 5 s-->np(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. [S1050-2947(98)02601-8].

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Documento generato il 15/07/20 alle ore 04:16:18