The hyperfine structure of λ 5790, λ 5789.7, λ 5769 and λ 4047 of the spectrum of Hg I was studied, and the structure of some terms was determined. The ratio of the hyperfine structure constant of Hg
199 to that of Hg
201 was calculated for the terms 6
p 1P1, 6
p 3P2 and 7
s 3S1, and it was found that the ratio is anomalous for the term 6
p 1P1. The quadrupole moment of Hg
201 was calculated to be 0.3
5·10
−24 cm
2.
Regularity in the displacement of even isotopes in lines of the mercury spectrum was found to exist in such a way that the ratio of the spacings Hg
204–Hg
202 : Hg
202–Hg
200 : Hg
200–Hg
198 is constant for all lines examined and is equal to 1 : 0.933 : 0.880. The same qualitative regularity was found in the isotopic displacement in lines of heavy elements consisting of at least three even isotopes.
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