Other
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..393b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 393-397
Other
22
Electron Transitions, Fine Structure, Optical Measurement, Oscillator Strengths, Relaxation Time, Resonant Frequencies, Sulfur, Curve Fitting, Decay Rates, Exponential Functions, Interstellar Matter, Ion Accelerators
Scientific paper
Mean lives and branching ratios for the 4s (3)S01 and 4s(double prime) (3)P01,2 levels of neutral sulfur were determined at the Toledo Heavy Ion Accelerator using beam-foil spectroscopic techniques. The mean lives obtained for the 4s (3)S01 4s(double prime) (3)P01, and (3)P02 levels, 1.875 +/- 0.094 ns, 2.034 +/- 0.102 ns, and 2.146 +/- 0.129 ns, respectively, represent the most accurate results available to date. Oscillator strengths for the transitions 3p4(3)P2, 1, 0-4s (3)S01 and 3p4(3)P2, 1, 0-4s(double prime) (3)P01,2 were derived from these mean lives together with the measured branching ratios. For comparison with published results which present only multiplet f-values, such f-values were computed from the measured individual line oscillator strengths. The value obtained for the 3p4(3)P-4s3S0 multiplet at 1814 A is 0.088 +/- 0.005, in good agreement with the mean of previous experimental measurements and theoretical calculations. With the mean life for the 4s(double prime) 3P00 level set equal to the mean of our determination for the other two 4s(double prime) (3)P0 levels (a valid assumption for LS coupling conditions, and consistent with the observed equality of the mean lives within the accuracy of our measurement), an oscillator strength for the 1299 A multiplet of 0.121 +/- 0.004 was found. Both results are in good agreement with recent large-scale theoretical calculations that incorporate the effects of configuration interaction.
Beideck D. J.
Ellis David G.
Federman Steven Robert
Schectman Richard M.
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