![]() ![]() ![]() ► Our results provide direct evidence for the assignments of ν1 and ν4 modes of gaseous CH3S. ► With the advantage of the mass-selective detection, the IR spectrum of CH3S shows absorption bands with no interference from the precursor. Absorptions features near 28 cm−1 are assigned to ν1 and ν4 modes of CH3S, respectively, and those near 29 cm−1 are tentatively assigned as combination transitions 315161(e) and 315161(a), respectively, from the ground vibrational state.► We applied the (1 + 1) IR-VUV photoionization method to obtain the IR spectrum of the CH3S radical in the range 2780–3270 cm−1. The IR spectrum of CH3S was obtained in the range 2790–3270 cm−1. Photolysis of CH3SH produced CH3S radicals that were ionized with (1 + 1) IR-VUV photoionization and detected with the time-of-flight technique. ![]() We present a detailed spectral study of the atmospherically important methylthio (CH3S) radical demonstrating the advantage of IR-VUV photoionization for vibrational spectroscopy of free radicals due to its mass selectivity.
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