WF13		15 min5:08

YOSHIHIRO SUMIYOSHI, YASUKI ENDO, Department of Pure and Applied Sciences, College of Arts and Sciences, The University of Tokyo, 153 Tokyo, Japan; YASUHIRO OHSHIMA, Department of Chemistry, Graduate School of Science, Kyoto University, 606-01 Kyoto, Japan.

We have studied the SH(²_i)-Ar and SD-Ar radical complexes with FTMW spectroscopy. The complexes were produced in a supersonic free jet by a pulsed discharge of H₂S or D₂S, which was diluted to 0.35% in Ar with a stagnation pressure of 2 atm. R-branch transitions in the lower spin-orbit component (\Omega=3/2) for the linear ²_i radicals were observed for J'' = 3/2 to J'' = 15/2 in the 8 - 26 GHz region. The transitions were split into two parity components owing to the parity doubling. Each parity component was split further due to the magnetic hyperfine interaction associated with the H/D nucleus.

Rotational constants for SH-Ar and SD-Ar were determined to be 1569.656(2) and 1567.707(2)MHz respectively. The value for SH-Ar agrees well with that of a previous LIF study. From the SH/SD data, it was confirmed that the argon atom is located at the hydrogen side of the SH radical. With an assumption that the S-H bond length is equal to that in the monomer, the H-Ar distance is calculated to be 2.900 Å, which is about 0.1 Å longer than that in OH-Ar. The effective D_J constants of SH-Ar and SD-Ar were found to have negative values of -58.4(7) and -50.7(6) kHz respectively.