Calculation of the Cross Section of Helium Ionization by an Electron Impact with the Formation of a Helium Ion in an Excited State

Journal Article · Tue Nov 15 04:00:00 EST 2005 · Optics and Spectroscopy

DOI:https://doi.org/10.1134/1.2135841· OSTI ID:20723222

Elizarov, A Yu ^[1]; Tupitsyn, I I ^[2]

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1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021 (Russian Federation)
2. St. Petersburg State University, Peterhof, St. Petersburg, 198904 (Russian Federation)

The total cross sections of He and He{sup +} ionization by an electron impact are calculated in the first Born approximation. Calculations of the matrix elements are carried out by the Fock-Dirac multiconfiguration relativistic method using an intermediate type of coupling with orthogonal functions of the initial and final states. A single-electron wave function of the continuous spectrum for an Auger electron is obtained using the Fock-Dirac single-configuration method. The results of the calculations performed with orthogonal and nonorthogonal wave functions of the initial and final states are compared. The ionization cross sections are calculated for cases in which a knock-on electron of the continuous spectrum is described by both the orthogonal and nonorthogonal wave functions with respect to the wave functions of the core electrons.

• OSTI ID: 20723222
• Journal Information: Optics and Spectroscopy, Journal Name: Optics and Spectroscopy Journal Issue: 5 Vol. 99; ISSN 0030-400X; ISSN OPSUA3
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALGEBRA
AUGER ELECTRON SPECTROSCOPY
BORN APPROXIMATION
ELECTRONS
EXCITED STATES
HELIUM
HELIUM IONS
IONIZATION
MATRIX ELEMENTS
RELATIVISTIC RANGE
SPECTRA
WAVE FUNCTIONS