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 6s^{2 1}S₀ 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°₁–³D₃ 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

Energy Levels and Wavelengths of the Isotopes of Mercury-198 and -202

Keivin Burns and Kenneth B. Adams
J. Opt. Soc. Am. 42(1) 56-59 (1952)

Wavelengths, Energy Levels, and Pressure Shifts in Mercury 198

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Hyperfine-Structure Separations, Isotope Shifts, and Nuclear Magnetic Moments of the Radioactive Isotopes Tl¹⁹⁹, Tl²⁰⁰, Tl²⁰¹, Tl²⁰², and Tl²⁰⁴

R. J. Hull and H. H. Stroke
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Spectro-Isotopic Assay of Lithium*

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Interference Measurements in the Spectrum of Argon I

Keivin Burns and Kenneth B. Adams
J. Opt. Soc. Am. 43(11) 1020-1024 (1953)