Abstract

Electrodeless tubes containing 0.5 mg of mercury were excited by radio waves of 110-mc frequency. In the region 5790–2446A the wavelengths of one hundred and ten components of the complex lines in the first spectrum of 80Hg199 have been measured relative to 5460.7532A with Fabry-Perot interferometers. Thirty-five lines in the first spectrum of 80Hg200 were similarly measured. Fifty energy levels of Hg-199 were derived and their centers of gravity were compared with the levels of the even isotopes. The 6s2 1S0 level was set at zero in all cases. The centers of gravity of the levels of Hg-199 fall between those of Hg-198 and Hg-200 but only one-seventh as far from the former as from the latter. For eighteen well-determined centers the median difference between observed and interpolated is ±0.002 cm−1. Fourteen centers of gravity involving twenty-nine levels of Hg-201 were derived from the data of Schuler and Keyston or Schuler and Jones. The median difference between these centers and levels interpolated between even isotopes is ±0.004 cm−1. Seven levels of Hg-204 (Schuler and Keyston, and Sterner) were compared with the levels of the other isotopes. The 6d1 D2 and 6d3 D1 levels are anomalous. Two hitherto unobserved lines of the type 3P°13D3 furnish levels that indicate that unlike the 3D1 and 3D2 the 3D3 levels are not inverted in the spectrum of Hg-199.

© 1952 Optical Society of America

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