Double and single electron capture in slow collisions of Ar/sup 9+,8+/ ions with He atoms

Journal Article · Mon May 01 00:00:00 EDT 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.4902· OSTI ID:6067861

Hutton, R; Prior, M H; Chantrenne, S; Chen, M H; Schneider, D

The technique of 0/sup 0/ Auger-electron spectroscopy has been used to study Na-like Ar/sup 7+/ excited states populated in double- and single-capture collisions by 90-keV Ar/sup 9+/ and 80-keV Ar/sup 8+/ projectiles from He target atoms. Metastable Ne-like Ar/sup 8+/ 2p/sup 5/3s /sup 3/P/sub 0,2/ states play an important role in populating several Ar/sup 7+/ final states. Careful He-target pressure dependence studies were performed to establish the excitation and/or capture mechanism for the Na-like core-excited levels. Highly nonequivalent 2p/sup 5/3lnl' configurations, with n values peaking at n = 8 but extending to near the series limits, were produced in double-electron capture onto Ar/sup 9+/ projectiles. The spectra have been identified and compared with calculated multiconfiguration Dirac-Fock (MCDF) Auger energies and previous measurements. The Auger decay of the Ar/sup 7+/ 2p/sup 5/3s3p /sup 4/D/sub 7/2/ metastable level has been observed and the energy of the line from the Breit induced decay has been measured. Allowed doublet lines from the 2p/sup 5/3s/sup 2/ /sup 2/P/sub 1/2,3/2/ states were also measured. The experimental values are in strong agreement with the results of the MCDF calculations.

• Research Organization: Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720
• OSTI ID: 6067861
• Journal Information: Phys. Rev. A; (United States), Vol. 39:9
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
ION-ATOM COLLISIONS
HELIUM
AUGER EFFECT
CROSS SECTIONS
ELECTRON CAPTURE
EXCITED STATES
EXPERIMENTAL DATA
KEV RANGE
MULTICHARGED IONS
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
DATA
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
FLUIDS
GASES
INFORMATION
ION COLLISIONS
IONS
NONMETALS
NUMERICAL DATA
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena