Lifetime measurements of single fine-structure levels of the multiplets e 8 S, z 6 F, z 4 F and z 4 D of neutral manganese are described. The levels were excited stepwise by a pulsed dye laser from metastable levels populated by a discharge. The lifetimes were determined directly from the exponential decay of the fluorescence using the delayed coincidence technique. The results are compared with beam-foil data and used to derive absolute gf values by means of the branching ratios of Greenlee and Whaling (1979). Comparison of these gf values with the data compilation of the National Bureau of Standards shows large scatter. Using the results of the sun model of Holweger and Muller (1974) the mean photospheric solar Mn abundance has been determined from twelve different lines to A Mn =5.47.
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Becker et al. (1980) studied this question.
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