Abstract
The beam-foil excitation technique has been used to measure mean-lives of excited atomic states in MgI, MgII, CaI, and CaII. The mean-lives of the 3 p 1 P ° states in MgI and the 4 p 1 P ° state in CaI have been measured to be 2.2±0.2×10 -9 sec and 6.2±0.5×10 -9 sec, respectively. The discrepancies with some of the earlier published data for CaI have been attributed to the anomalously high cross section for broadening of the resonance line. For some of the doublets in MgII and CaII, mean-lives have been obtained for both transitions of the doublets, and the intensity ratios have been checked. Oscillator strengths have been evaluated and compared with theoretical predictions.
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