Microwave spectroscopic study of the CO-H2S complex

Rotational spectra of the CO-H2S complex were studied using a cavity Fourier transform microwave spectrometer. Altogether 16 isotopomers were investigated. The tunneling splitting due to interchange of the “bonded” and “non-bonded” hydrogen (deuterium) nuclei of the H2S (D2S) subunit was observed and analyzed. In addition, the nuclear quadrupole hyperfine structures due to the quadrupolar 33S and 17O nuclei could be resolved and analyzed. The resulting rotational, tunneling, and hyperfine constants were used to derive structural and dynamical information about the complex.