Photoion Auger-electron coincidence measurements near threshold

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6477501

Levin, J C; Biedermann, C; Keller, N; Liljeby, L; Short, R T; Sellin, I A ^[1]; Lindle, D W ^[2]

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1. Tennessee Univ., Knoxville, TN (USA). Dept. of Physics Oak Ridge National Lab., TN (USA)
2. National Inst. of Standards and Technology (NCSL), Gaithersburg, MD (USA)

The vacancy cascade which fills an atomic inner-shell hole is a complex process which can proceed by a variety of paths, often resulting in a broad distribution of photoion charge states. We have measured simplified argon photoion charge distributions by requiring a coincidence with a K-LL or K-LM Auger electron, following K excitation with synchrotron radiation, as a function of photon energy, and report here in detail the argon charge distributions coincident with K-L{sub 1}L{sub 23} Auger electrons. The distributions exhibit a much more pronounced photon-energy dependence than do the more complicated non-coincident spectra. Resonant excitation of the K electron to np levels, shakeoff of these np electrons by subsequent decay processes, double-Auger decay, and recapture of the K photoelectron through postcollision interaction occur with significant probability. 17 refs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER; NSF
• DOE Contract Number: AC05-84OR21400; AC02-76CH00016
• OSTI ID: 6477501
• Report Number(s): CONF-901116-14; ON: DE91001211
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
AUGER ELECTRON SPECTROSCOPY
AUTOIONIZATION
CHARGE DISTRIBUTION
CHARGE STATES
CHARGED PARTICLES
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
INFORMATION
IONIZATION
IONS
K SHELL
MULTICHARGED IONS
NUMERICAL DATA
PHOTOIONIZATION
RADIATION SOURCES
SPECTROSCOPY
SYNCHROTRON RADIATION SOURCES