Physics
Scientific paper
Aug 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969zphy..228..440b&link_type=abstract
Zeitschrift für Physik, Volume 228, Issue 4, pp.440-453
Physics
8
Scientific paper
Radiative lifetimes of some highly excited levels in Sr I were measured by zero-field level crossing technique. These levels have been populated using optical excitation starting from the metastable 4 d 5 s 1 D 2 or 5s 5p 3 P 2,1,0 states. The high population of these metastable levels necessary for the experiments was obtained by a discharge in the pure Sr vapour burning in the atomic beam oven. The following lifetimes have been determined (in units of 10-8 sec): τ(5 s 6s3 S 1)=1.09±0.11, τ(5 s 5 d 3D1)=1.67±0.10, τ(5 s4f1 F 3)=3.43±0.28, τ(4d5 p 1 D 2)=2.19±0.16, τ(5 p 2 3P1)=0.88±0.12, τ(5 p 2 3 P 2)=0.78{-0.10/+0.26}. These results are compared with lifetimes derived from oscillator strengths given in the literature, and the reliability of different oscillator strengths tables is discussed. A corresponding discussion is given for radiative lifetimes of some levels in Ca I published previously. Good agreement with data derived from arc emission oscillator strengths has been found. Ca lifetimes are fairly well consistent with oscillator strengths calculated with semiempirical scaled Thomas-Fermi-wave functions.
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