Abstract
Natural lifetimes of some highly excited levels in the Pb-I spectrum have been measured by the zero field level crossing (Hanle) method. The levels were reached by optical excitation from the metastable 6p 2 3 P 2 and 6p 2 3 P 1 states, were a considerable population had been created by means of adc discharge in a Pb atomic beam. An atomic beam source producing atoms in metastable states is described. For the lifetimes τ of the investigated levels we find:τ(6p(1/2)6d 3 D 1)=3.74(28) ns,τ(6p(1/2)6d 3 F 2)=25.8(1.3) ns,τ(6p(1/2)6d 3 D 2)=4.17(−31) (−49) ns,τ(6p(1/2)6d 3 F 3)=6.08(26) ns,τ(6p(3/2)7s)3 P 2=5.85(27) ns. These results are compared with lifetimes derived from oscillator strengths given in the literature.
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The authors gratefully acknowledge the constant support and encouragement of Professor I. Lindgren. We also want to thank Mr. S. Pehrson of the Physics Department workshop for good work on different parts of the apparatus and Mr. R. Eliasson for patient quartz blowing.
This work was supported by Statens Naturvetenskapliga Forskningsråd.
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Garpman, S., Lidö, G., Rydberg, S. et al. Lifetimes of some highly excited levels in the Pb-I spectrum measured by the hanle method. Z. Physik 241, 217–235 (1971). https://doi.org/10.1007/BF01395330
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DOI: https://doi.org/10.1007/BF01395330