Pulsed beam Fourier transform microwave measurements on OCS and rare gas complexes of OCS with Ne, Ar, and Kr

A pulsed molecular beam Fourier transform microwave spectrometer, which has been recently constructed at NBS, was employed for measurements on several monomer and van der Waals species of OCS. The absorption–emission cell consists of a Fabry–Perot resonant cavity inside a high vacuum chamber. A pulsed nozzle is used to generate a supersonic molecular beam of a seeded inert gas. New spectra of Ne–OCS, Ar–OC34S, and for four Kr isotopes of Kr–OCS are reported, as well as structure analyses of each species. The nuclear electric quadrupole hyperfine structure of 83Kr–OCS has been resolved and yields eQqaa=1.601(7) MHz and eQqbb=−1.857(3) MHz.