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Atomic L-shell ionization by protons: Dirac-Hartree-Slater calculation of cross sections

Journal Article · · Phys. Rev. A; (United States)
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Coulomb ionization of the L subshells of Au and U by slow protons has been calculated in the relativistic plane-wave Born approximation (PWBA), with Dirac-Hartree-Slater (DHS) wave functions. Semiclassical corrections for binding-energy change and Coulomb deflection are applied as developed by Brandt and Lapicki. Considerable improvement is attained in these ab initio relativistic PWBA calculations with DHS wave functions, as compared with earlier classical, semiclassical, and PWBA results based on screened hydrogenic wave functions. The predicted subshell ionization cross sections agree well with experimental data. The effect of relativity tends to cancel partially the effects of binding and Coulomb deflection. The calculated energies at which minima occur in sigma/sub L//sub 1//sigma2 and sigma/sub L//sub 3//sigma2 cross-section ratios also agree well with observation. Predicted total L x-ray-production cross sections agree extremely well with experiment. The L..cap alpha../L..gamma.. and L..cap alpha../L..beta.. x-ray emission rates for p+Au agree with measurements if L fluorescence and Coster-Kronig yields are adjusted in accordance with recent relativistic theory.
Research Organization:
Department of Physics and Chemical Physics Institute, University of Oregon, Eugene, Oregon 97403
OSTI ID:
6617957
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 26:3; ISSN PLRAA
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
ACTINIDES
ATOM COLLISIONS
BORN APPROXIMATION
CATIONS
CHARGED PARTICLES
COLLISIONS
COULOMB IONIZATION
CROSS SECTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
FUNCTIONS
GOLD
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
L SHELL
METALS
RELATIVISTIC RANGE
SEMICLASSICAL APPROXIMATION
TRANSITION ELEMENTS
URANIUM
WAVE FUNCTIONS