Mechanism of the enhancement of some high-lying resonance series in the photoionization spectra of excited helium

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

DOI:https://doi.org/10.1103/PhysRevA.50.1321· OSTI ID:7270729

Tang, J; Shimamura, I ^[1]

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1. The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-01 (Japan)

The hyperspherical close-coupling method is used to compare the detailed structures in the photoionization spectra of He(1 [sup 1] [ital S]) and He[sup *](2 [sup 1][ital S]) between the He[sup +]([ital n]=4) and He[sup +]([ital n]=6) thresholds; both the total photoionization cross section and the partial cross sections for the production of He[sup +]([ital n]) are studied. Some doubly excited resonance series of excited angular modes that are either weak or unobservable in the ground-state spectrum are greatly enhanced in the metastable-state spectrum. This corroborates that previously derived propensity rules do not apply, in fact, to the photoionization of He[sup *](2 [sup 1][ital S]). The dependence of the propensity rules on the initial state is interpreted in terms of the correlation patterns of its wave function in the region of the hyperradius that contributes dominantly to the photoionization cross section. This interpretation suggests a generality of the enhancement of some resonance series in excited-state spectra. Some overlapping resonances that are overlooked in the literature are uncovered and analyzed by using the Gailitis-average procedure.

• OSTI ID: 7270729
• 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

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AUGMENTATION
COMPARATIVE EVALUATIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVALUATION
EXCITATION
EXCITED STATES
FLUIDS
GASES
GROUND STATES
HELIUM
IONIZATION
METASTABLE STATES
NONMETALS
PHOTOIONIZATION
RARE GASES
RESONANCE