New laboratory data of ethyl mercaptan, CH 3 CH 2 SH, in the millimeter-and submillimeter-wave domains (up to 880 GHz) provided very precise values of the spectroscopic constants that allowed the detection of gauche-CH 3 CH 2 SH toward Orion KL.This identification is supported by 77 unblended or slightly blended lines plus no missing transitions in the range 80-280 GHz.A detection of methyl mercaptan, CH 3 SH, in the spectral survey of Orion KL is reported as well.Our column density results indicate that methyl mercaptan is 5 times more abundant than ethyl mercaptan in the hot core of Orion KL.
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