Recent hyperfine structure investigations in the configurations 4f 136s 2, 4f 136s6p, and 4f 125d6s 2 of Tm I

Abstract

By use of optical hyperfine structure investigations in the Tm I spectrum theA- values of 20 levels of the configurations 4f 13 6s 6p and 4f 12 5d 6s 2 and theA-value of 4f 13 6s 2 2 F 5/2 were determined very accurately. These data and tenA-factors from former experiments are used for theoretical calculations. 30A-factors have been interpolated from intermediate coupling wave functions using 9 effective mono-electronic parameters. The r.m.s. deviation between experimental and theoreticalA- values amounts to 0.5 10−3 cm−1 and represents 3/100 of the average value of the measuredA-factors.