EPR Spectra of SH, SD, and SO Radicals in the Gaseous State

A 12-line EPR spectrum at a microwave frequency of 8.850 kMc/sec has been observed in the field region from 7400 to 7700 G that is attributed to electric-dipole transitions between Zeeman levels of the J=32 rotational state of gaseous SH(2Π32). Average Λ splittings and proton hyperfine splittings were 190 G and 5.4 G, respectively. The SH radicals were produced in the spectrometer cavity by adding H2S at the cavity entrance to a stream of discharge-dissociated H2O vapor flowing through the cavity. When H2S was added to a stream of dissociated D2O, an additional spectrum attributed to SD(2Π32,J=32) was observed. Another species in these gaseous systems gives rise to a third EPR spectrum that is believed to result from electric-dipole transitions between Zeeman levels of different rotational states of SO(3Σ).