Electric field effects on barium autoionizing spectra
Stark spectra for atomic barium in the autoionizing region below the 5d{sub 3/2} ionization threshold are studied by photoionization of the laser-excited 5d6p {sup 3}D{sub 1}{sup O} bound level, in a combined experimental and theoretical study. The zero-field spectra in this energy range already show tremendous complexity, owing to the presence of many interacting Rydberg channels. The electric field then dramatically increases the number of observable resonances, as is well known in the alkali atom Stark effect. In the quasidiscrete energy range relevant here, all Stark tunneling effects are negligible but the field effects are nevertheless highly nonperturbative. The complex spectra are found to be well-described by starting from a nearly ab initio eigenchannel R-matrix calculation of the zero-field channel interaction matrices of quantum defect theory, for which there are 86 relevant channels. By then applying a Harmin-Fano-type local frame transformation from spherical to parabolic coordinates, most of the observations are successfully reproduced.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 281194
- Report Number(s):
- CONF-9305421--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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