Indirect contributions to electron-impact ionization of Kr[sup 24+], Kr[sup 25+], and Xe[sup 43+]

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.1874· OSTI ID:6653503

Chen, M H; Reed, K J ^[1]

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1. High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Electron-impact ionization cross sections have been calculated for Kr[sup 24+] and Kr[sup 25+]. The contributions of excitation-autoionization and resonant excitation double autoionization (REDA) were included in addition to the cross sections for direct ionization of a 3[ital s] electron. For Xe[sup 43+] the REDA contributions were extended to two times the ionization threshold. The calculations were performed using the relativistic distorted-wave and the multiconfiguration Dirac-Fock methods. For Kr[sup 25+] the indirect processes enhance the ionization cross section by a factor of 4. For Kr[sup 24+] the total cross section is about 3.5 times the direct-ionization cross section. The REDA process produces numerous strong resonances and contributes about 20% to the average ionization cross section for Kr[sup 24+] and Kr[sup 25+] and 15% to the average ionization cross section for Xe[sup 43+].

• OSTI ID: 6653503
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:3; ISSN PLRAAN; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AUTOIONIZATION
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ION COLLISIONS
IONIZATION
IONS
KRYPTON IONS
MULTICHARGED IONS
RESONANCE
XENON IONS