First-order theories for adiabatic [ital L]-shell ionization by protons

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.1301· OSTI ID:7160577

Smit, Z; Orlic, I ^[1]

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1. Department of Physics, National University of Singapore, Singapore 0511 (Singapore)

[ital L]-shell ionization cross sections, evaluated as mean values of the experimental data, were compared with the first-order theoretical values obtained by the plane-wave Born and semiclassical method. Hydrogenic Dirac wave functions in the united-atom limit were employed in the calculation. The plane-wave Born approximation cross sections with Dirac-Hartree-Slater wave functions were obtained from the tables of Chen and Crasemann [At. Data Nucl. Data Tables 33, 217 (1985); 41, 257 (1989)]. The agreement between the experimental and semiclassical cross sections was generally better than 20%, except for the [ital L][sub 1] subshell of heavy elements and for the very adiabatic region of [ital L][sub 2,3] subshells. The differences between both sets of data were largely reproduced by a simplified coupled-channel calculation performed nonrelativistically for a single final state. The calculation also suggests that, due to the uncertainties of the fluorescence yields, the ionization cross sections deduced from the measured data are overestimated by 10%.

• OSTI ID: 7160577
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:2; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ADIABATIC PROCESSES
ATOM COLLISIONS
BARYONS
BORN APPROXIMATION
COLLISIONS
COMPARATIVE EVALUATIONS
DATA
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
EVALUATION
EXPERIMENTAL DATA
FERMIONS
HADRONS
INFORMATION
INNER-SHELL IONIZATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
L SHELL
MATHEMATICS
NUCLEONS
NUMERICAL DATA
PROTONS
STATISTICS