LETTERS TO THE EDITORconjunction with a low noise input circuit described by Good 1 for the 87 kc/sec amplifier and a low pass filter gives a sensitivity of 1X 10~7 nepers/cm as judged by the ability to detect all of the weak N^Hs lines tabulated by Kisliuk and Townes. 2 The observed spectrum consists of some 55 lines extending from 19,940 Mc/sec to 25,656 Mc/sec with only a few scattered lines between 23,790 Mc/sec and 24,980 Mc/sec suggesting two groupings of lines. The region from 25,656 Mc/sec to 25,920 Mc/sec which is the present upper limit of our equipment is void of lines. The complete tabulation of lines is shown in Table I, where the TABLE I. Methyl mercaptan microwave spectra. Frequencies are known to an estimated 5 Mc/sec. Frequency (Mc/sec) 19,909
Laboratory and in particular to James P. Glore. Thanks are due to the reactor group for sample irradiations and to Brace J. Dropesky for the preparation of the many gamma-ray calibration sources needed.
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