Lifetimes of some highly excited levels in the Pb-I spectrum measured by the hanle method |
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Authors: | S Garpman G Lidö S Rydberg S Svanberg |
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Institution: | 1. Department of Physics, Chalmers University of Technology, G?teborg, Sweden
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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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