Abstract
We present a detailed spectral study of the atmospherically important methylthio (CH 3S) radical demonstrating the advantage of IR-VUV photoionization for vibrational spectroscopy of free radicals due to its mass selectivity. Photolysis of CH 3SH produced CH 3S radicals that were ionized with (1 + 1) IR-VUV photoionization and detected with the time-of-flight technique. The IR spectrum of CH 3S was obtained in the range 2790–3270 cm −1. Absorptions features near 2819 and 2904 cm −1 are assigned to ν 1 and ν 4 modes of CH 3S, respectively, and those near 2978 and 3241 cm −1 are tentatively assigned as combination transitions 3 15 16 1(e) and 3 15 16 1(a), respectively, from the ground vibrational state.
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