Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.4676· OSTI ID:7307484

Bannister, M E ^[1]; Guo, X Q; Kojima, T M ^[2]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
2. Joint Institute for Laboratory Astrophysics of the University of Colorado, the National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)

Absolute total cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions have been measured using a crossed-beams technique from below threshold to 500, 400, and 500 eV, respectively, with absolute uncertainties of 12% or less. The measured cross sections are in good agreement with distorted-wave calculations and show significant contributions from excitation autoionization. Nonzero cross sections below threshold for the Kr[sup 4+] and Kr[sup 5+] ions suggest the presence of metastable ions in those two species that were extracted from an electron-cyclotron-resonance ion source. Such evidence of metastable ions was not found in the case of the Kr[sup 7+] ion measurment.

• OSTI ID: 7307484
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CHARGED PARTICLES
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY LEVELS
EXCITED STATES
ION COLLISIONS
IONIZATION
IONS
KRYPTON IONS
METASTABLE STATES
MULTICHARGED IONS
TOTAL CROSS SECTIONS