✍ Scribed by Mitsutoshi Tanimoto; Thomas Klaus; Holger S.P. Müller; Gisbert Winnewisser
No coin nor oath required. For personal study only.
The rotational spectra of the HSS and DSS radicals were studied in selected regions between 331 and 883 GHz. The radicals were produced by discharging a gaseous mixture of hydrogen (or deuterium) and hydrogen sulfide in the cell. The observation of the b-type Q-branch and R-branch lines with K a ϭ 2-1 and 3-2 for HSS and DSS, respectively, as well as the a-type R-branch lines allowed the improvement and the determination of the molecular constants among them (in MHz) HSS DSS A Ϫ (B ϩ C)/2 289 092.41 147 806.5 (B ϩ C)/2 7886.552 7603.098 (B Ϫ C)/4 54.7762 96.089 D K 24.33 6.79
We have reevaluated the harmonic force field of HSS and the ground state average and approximate equilibrium structural parameters. For the latter, we obtained r(HS) ϭ 135.23 pm, r(SS) ϭ 196.03 pm, and Є ϭ 101.74°. These results are compared with those from previous and own quantum chemical calculations as well as with results of related molecules.
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Experiments on helium with a large diameter (1 m) rotating cryostat at speeds up to 50 Hz are described. Radial temperature distributions have been measured with axial pressures ranging from 25 x 103 to 2.0 x 10 s Nm -2. It is concluded that the temperature distributions are isentropic to within 30