Double x-ray emission following resonant transfer and excitation in collisions of H-like ions with H sub 2

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.1554· OSTI ID:5444066

Badnell, N R ^[1]

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1. Department of Physics, Auburn University, Auburn, Alabama 36849-5311 (US)

We have solved the capture-cascade equations for double x-ray emission following resonant transfer and excitation in collisions of S{sup 15+} and Ge{sup 31+} with H{sub 2}. Configuration mixing within the autoionizing complex enhances the cascade-produced {ital K}{alpha}-{ital K}{alpha} peak and removes the discrepancy between single-configuration {ital LS}-coupling results and experiment for S{sup 15+}. Intermediate coupling increases the population of the metastables and so reduces the {ital K}{alpha}-{ital K}{alpha},{ital K}{beta},{ital K}{gamma} cross sections by up to 20% over the {ital LS}-coupling results. The coincidence cross sections for highly excited states are still about a factor of 2 ({ital K}{alpha}-{ital K}{gamma}) or 3 (({ital K}{beta}+{ital K}{gamma})--({ital K}{beta}+{ital K}{gamma})) smaller than experiment for S{sup 15+}, however. In the case of Ge{sup 31+}, the total coincidence cross section lies 10--30 % below experiment, while the {ital K}{alpha}--({ital K}{beta}+{ital K}{gamma}) cross section is now somewhat larger than experiment. The comprehensiveness of the theoretical calculations suggests that the experimental results may need to be reexamined where significant discrepancies with theory remain.

• DOE Contract Number: FG05-86ER53217
• OSTI ID: 5444066
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 44:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHARGED PARTICLES
COLLISIONS
CONFIGURATION MIXING
COUPLING
DECAY
ELECTRON TRANSFER
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
GERMANIUM IONS
HYDROGEN
INTERACTIONS
INTERMEDIATE COUPLING
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
ISOELECTRONIC ATOMS
K SHELL
L-S COUPLING
MOLECULE COLLISIONS
MULTICHARGED IONS
NONMETALS
PARTICLE DECAY
RADIATIVE DECAY
SPECTRA
SULFUR IONS
X-RAY SPECTRA