Single ionization in the positron-Helium atom collision

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281245

Chen, Z; Msezane, A Z ^[1]

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1. Clark Atlanta Univ., GA (United States)

Single ionization cross sections have been studied in the collision between a positron (electron) and a Helium atom using coupled channel method. The Hartree-Fock Hamiltonian of the Helium atom has been diagonalized on a finite Hilbert basis. 9s, 9 p and 9 d pseudo-states have been included in the calculation. The excitation matrix elements are evaluated analytically. A U-matrix method with a parabolic curve fitting technique has been used to solve the coupled channel equations. The calculation with different positron paths shows that a hyperbolic classical trajectory gives better theoretical results than a straight-line calculation when the positron energies are low. Our theoretical ionization cross sections are in good agreement with the experimental data in the energy range from 50 to 1000 eV.

• OSTI ID: 281245
• Report Number(s): CONF-9305421--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
HARTREE-FOCK METHOD
HELIUM
IONIZATION
POSITRON-ATOM COLLISIONS