Abstract

Sixty-four lines in the arc spectrum of cesium have been measured interferometrically by utilizing several different light sources, to obtain, in general, wavelengths with an uncertainty of ±0.001 A, and energy levels with an uncertainty of ±0.001 cm⁻¹. The energy levels of the individual series have been represented by extended Ritz formulas with a root-mean-square deviation of less than 0.004 cm⁻¹. The value of the series limit derived from these formulas is (31 406.450±0.030) cm⁻¹. Eight terms of the ²F series have been represented by a two-parameter polarization formula with a rms deviation of 0.04 cm⁻¹.

The hyperfine components of the $6^2{S}_{\frac{1}{2}},8^2{S}_{\frac{1}{2}}$, and $6^2{P}_{\frac{1}{2}}$ levels have been resolved. By making use of the theoretically predicted dipole intensity relations, rough values of the splitting factors in the unresolved ²S and ²D states have been obtained which agree with the values predicted on the basis of the Fermi-Segrè-Goudsmit formula. In the forbidden transitions $n^2{D}_{\frac{3}{2},\frac{5}{2}}-6^2{S}_{\frac{1}{2}}$, the theoretical quadrupole intensity relations were used to obtain the splitting factors of the $n^2{D}_{\frac{3}{2},\frac{5}{2}}$ states. These splitting factors differed markedly from those predicted by the Fermi-Segrè-Goudsmit formula.

© 1962 Optical Society of America

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