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Simultaneous electron capture and excitation in ion-atom collisions

Conference ·
OSTI ID:6448379
; ; ; ; ; ; ;
A review of recent efforts to observe simultaneous electron capture-and-K-shell excitation in ion-atom collisions is presented. This process which has been referred to as resonant-transfer-and-excitation (RTE), is qualitatively analogous to dielectronic recombination (inverse Auger transition) in free-electron-ion collisions, and, hence, is expected to be resonant. Experimentally, events having the correct signature for simultaneous capture-and-excitation are isolated by detecting projectile K x rays in coincidence with ions which capture a single electron. In a recent experiment involving 70-160 MeV S/sup 13 +/ ions incident on Ar, a maximum was observed in the yield of projectile K x rays associated with electron capture. This maximum is attributed to simultaneous capture - and excitation. The position (120 MeV) and width (60 MeV) of the observed maximum are in good agreement with theoretical calculations. The data indicate that RTE is an important mechanism for inner-shell vacancy production in the energy range studied.
Research Organization:
Brookhaven National Lab., Upton, NY (USA); Western Michigan Univ., Kalamazoo (USA); New Univ. of Ulster, Coleraine (UK); North Carolina Univ., Chapel Hill (USA)
DOE Contract Number:
AC02-76CH00016
OSTI ID:
6448379
Report Number(s):
BNL-32343; CONF-821123-33; ON: DE83005799
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ARGON IONS
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
INNER-SHELL IONIZATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MULTICHARGED IONS
NONMETALS
RARE GASES
RESONANCE
SPECTRA
SULFUR IONS
X-RAY SPECTRA
XENON