Electron excitation cross sections for the SII transitions 3s{sup 2}3p{sup 3}{sup 4}S{sup o}{r_arrow}3s{sup 2}3p{sup 3}{sup 2}D{sup o}, {sup 2}P{sup o}, and 3s3p{sup 4}{sup 4}P
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)
- Department of Physics, Clark Atlanta University, Atlanta, Georgia 30314 (United States)
Experimental and theoretical collisional excitation cross sections are reported for the transitions 3s{sup 2}3p{sup 3}{sup 4}S{sup o}{r_arrow}3s{sup 2}3p{sup 3}{sup 2}D{sup o}, {sup 2}P{sup o}, and 3s 3p{sup 4}{sup 4}P in SII. The transition wavelengths (energies) are 6716 {Angstrom} (1.85 eV), 4069 {Angstrom} (3.05 eV), and 1256 {Angstrom} (9.87 eV), respectively. In the experiments, use is made of the energy-loss merged-beams method. The metastable fraction of the SII beam was assessed and minimized. The contribution of elastically scattered electrons was reduced by the use of a lowered solenoidal magnetic field and a modulated radio-frequency voltage on the analyzing plates and by retarding grids to reject the elastically scattered electrons with larger Larmor radii. For each transition, comparisons are made among experiments, the new 19 state R-matrix calculation, and three other close-coupling calculations. {copyright} {ital 1997} {ital The American Astronomical Society}
- OSTI ID:
- 552951
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 484; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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