Collision spectroscopy of Ar sup 8+ + He at low velocities ( v lt 1 a. u. )

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.1321· OSTI ID:7034851

Bliman, S; Suraud, M G; Hitz, D; Huber, B A ^[1]; Lebius, H ^[2]; Cornille, M ^[3]; Rubensson, J E; Nordgren, J ^[4]; Knystautas, E J ^[5]

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1. Departement de Science des Materiaux, DRFG, Centre d' Etudes Nucleaires de Grenoble, Boite Postale 85X, F-38041 Grenoble CEDEX (France)
2. Institut fuer Experimentalphysik AG II, Ruhr-Universitaet, D-4630 Bochum (Germany)
3. Departement d'Astronomie Relativiste et de Cosmologie, Observatoire de Paris, F-92195 Meudon CEDEX (France)
4. Department of Physics, University of Uppsala, Box 530, S-7521 Uppsala (Sweden)
5. Departement de Physique, Universite Laval, Quebec, G1K 7P4 (Canada)

Single- (SC) and double-electron capture (DC) have been studied for collisions of Ar{sup 8+} with He using x-ray and vacuum ultraviolet (vuv) spectroscopy at a collision energy of 80 keV as well as translational-energy spectroscopy (TES) at lower collision energies (8 keV). It is shown that both processes involving the ground-state ion terminate in vuv photon emission, i.e., nonautoionizing levels are populated. The SC, by the long-lived metastable species Ar{sup 8+*} (2{ital p}{sup 5}3{ital s}){sup 3}{ital P}{sub 0,2}, populates mostly the Na-like core-excited levels with {ital n}=4: Ar{sup 7+*} (2{ital p}{sup 5}3{ital s} {sup 3}{ital P} 4{ital l}){sup 2,4}{ital L}{sub {ital J}}. With the use of calculated decay and autoionization rates, the measured vuv spectra are analyzed and compared with the TES results and the Auger spectra measured by other authors. It is shown that the stabilization of these core-excited states is both radiative and autoionizing. The DC by the metastable projectile is not yet fully understood.

• OSTI ID: 7034851
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
ATOM COLLISIONS
ATOMS
CAPTURE
CHARGED PARTICLES
COLLISIONS
DECAY
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE
ELEMENTS
ENERGY LOSSES
ENERGY RANGE
EXTREME ULTRAVIOLET RADIATION
FLUIDS
GASES
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZING RADIATIONS
IONS
ISOELECTRONIC ATOMS
KEV RANGE
KEV RANGE 10-100
LOSSES
MULTICHARGED IONS
NONMETALS
OXYGEN
PARTICLE DECAY
RADIATIONS
RADIATIVE DECAY
RARE GASES
ULTRAVIOLET RADIATION
X RADIATION