On Some Regularities in the Isotope Effect in the Spectrum of Lead. Part II.

Abstract

The hyperfine structures of the Pb I lines λλ 5201, 5005, 7228, 4168, 4062, 4020, 3740, 3672, 3573, 4058, 2873, 3683, 3640, 2833 and Pb II lines λλ 6660, 4386.4, 5042.5, 4153 and Pb III line λ 4182.5 were measured, and the ratio of the distances of the adjacent even isotope components Δ ν(206-204)/ Δ ν(208-206) was determined to be 0.905±0.010. The ratio Δ ν(207-206)/ Δ ν(208-207) was found to be constant for all lines (except λ 4062) within experimental error and was found to be 0.615±0.008. The anomaly found in the case of λ 4062 is interpreted to be due to a perturbation.