FOURIER-TRANSFORM MW SPECTROSCOPY OF THE SH(2II,)-Ar AND SD-Ar RADICAL COMPLEXES
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Date
1996
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Publisher
Ohio State University
Abstract
We have studied the $SH(^{2}\Pi,)-Ar$ and SD-Ar radical complexes with FTMW spectroscopy. The complexes were produced in a supersonic free jet by a pulsed discharge of $H_{2}S$ or $D_{2}S$, 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 $^{2}\Pi_{i}$ radicals were observed for $J^{\prime\prime} = 3/2$ to $J^{\prime\prime} = 15/2$ 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 $study.^{a}$ 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 band length is equal to that in the monomer, the H-Ar distance is calculated to be 2,900 \AA, which is about, 0.1 \AA longer than that in OH-Ar. The effective $D_{s}$ constants of SH-Ar and SD-Ar were found to have negative values of $-58.4(7)$ and $-50.7(6)$ kHz respectively.
Description
$^{a}$Min-Chieh Yang, Aldo P. Salzberg, Bor-Chem Chang, Christopher C. Carter, and Terry A. Miller, J Chem Phys. 98 (1993) 4301
Author Institution: Department of Pure and Applied Sciences, College of Arts and Sciences, The University of Tokyo; Department of Chemistry, Graduate School of Science
Author Institution: Department of Pure and Applied Sciences, College of Arts and Sciences, The University of Tokyo; Department of Chemistry, Graduate School of Science