Photoionization from metastable (1[ital s]2[ital s]) [sup 1][ital S[ital e]] and [sup 3][ital S[ital e]] states of the He atom for energies between the [ital N]=2 and 3 thresholds of He[sup +]

Journal Article · Mon Jan 31 23:00:00 EST 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.1057· OSTI ID:5190621

Zhou, B; Lin, C D ^[1]

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1. Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States)

Photoionization cross sections from the metastable state (1[ital s]2[ital s]) [sup 1][ital S[ital e]] of the He atom for photon energies between the He[sup +] ([ital N]=2) and ([ital N]=3) thresholds are calculated using the hyperspherical close-coupling method. The calculated spectra are convoluted with an energy resolution of 5.4 meV and are compared with the spectra for photoionization from the ground state. It is found that among the four possible outgoing channels, the 1[ital s][epsilon][ital p] channel, which is the dominant channel for photoionization from the ground state, makes negligible contributions to the total cross sections for photoionization from the metastable state. As a result, the propensity rule derived from the ground-state photoionization no longer applies and more series of the doubly excited states are populated with significant spectral intensity in photoionization from the metastable state. Photoionization cross sections from the metastable (1[ital s]2[ital s]) [sup 3][ital S[ital e]] state are also calculated and analyzed.

• OSTI ID: 5190621
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:2; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
CROSS SECTIONS
ELEMENTS
ENERGY
ENERGY LEVELS
EVALUATION
EXCITED STATES
FLUIDS
GASES
GROUND STATES
HELIUM
HELIUM IONS
IONIZATION
IONS
METASTABLE STATES
NONMETALS
PHOTOIONIZATION
RARE GASES
THRESHOLD ENERGY