Total cross sections for L-shell Auger-electron production and vacancy production in slow Si-Ar collisions

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.28.161· OSTI ID:6047716

Schneider, D; Nolte, G; Wille, U; Stolterfoht, N

Total cross sections for Si L and Ar L Auger-electron production were measured in collisions of 35--500-keV Si/sup +/ ions incident on Ar atoms, and absolute cross sections for L-shell vacancy production were deduced. The experimental results are discussed in terms of the molecular-orbital model of atomic collisions. It is found that electron promotion via the 4fsigma molecular orbital is the dominant mechanism for Si L-shell vacancy production. Excitation of 3d..pi.. and 3dsigma electrons via 3ddelta-3d..pi..-3dsigma rotational coupling at small internuclear distances is treated explicitly. The calculated cross section for 3dsigma excitation is found to reproduce the experimental cross section for Ar L-shell excitation in the range of collision energies up to 200 keV. L-L vacancy-sharing processes at large internuclear distances are discussed as possible mechanisms for the observed rise of the Ar L cross section beyond this energy.

• Research Organization: Bereich Kern- und Strahlenphysik, Hahn-Meitner-Institut fuer Kernforschung Berlin GmbH, Berlin, West Germany and Fachbereich Physik, Freie Universitat Berlin, D-1000 Berlin 39, West Germany
• OSTI ID: 6047716
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 28:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
AUGER EFFECT
BEAMS
CHARGED PARTICLES
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
L SHELL
MOLECULAR ORBITAL METHOD
NONMETALS
NUMERICAL DATA
POINT DEFECTS
PRODUCTION MECHANISMS
RARE GASES
SILICON IONS
TOTAL CROSS SECTIONS
VACANCIES