Abstract
The hyperfine structures (hfs) of mixed (M1+E2) multipole lines 461.5 nm (6p3 2P1/2→6p3 4S3/2) and 647.6 nm (6p3 2D5/2→6p3 4S3/2) of Bi I and 733.2 nm (6p2 1D2→6p2 3P1) of Pb I are presented. A computer modelling technique was used to obtain the predicted hfs contours of these lines. By varying the free parameters describing the line shape and the electric-quadrupole admixture DE2 the calculated profiles were fitted to the recorded spectra. The DE2 values obtained from the best fits were found to be (7.3±0.9), (17.6±1.2) and (5.0±0.6)% for the 461.5, 647.6 and 733.2 nm lines, respectively. These results are compared with other experiments and recent theories.
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