摘要：

was modulated at 400 cps for purposes of phase sensitive detection. The y-axis polarized transition was observed at a frequency of 13.4 + 0.2Mc. This agrees to within the experimental with the frequency of '/2(A B) = 16 i 3 Mc that is predicted for the y-axis polarized transition, A/, <-+ 02. The second equally intense absorption at 15.5 4 0.2 Mc was found to be z-axis polarized. This agrees satisfactorily with the frequency l/2(B C) = 15 3 Mc that is predicted for the zaxis polarized transition, 02 +, 413. In these experiments the zero-field signal/ noise ratio was ca. 50/1. The estimated line-width (on a frequency scale) at zerofield is of the order of one megacycle. Further work on this subject is in progress.

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