An investigation of the rotational spectrum of H2S⋅⋅⋅HF by pulsed-nozzle, Fourier-transform microwave spectroscopy: Determination of the hyperfine coupling constants χa a (33S), χDa a, and DH(D)Fa a
- 1 July 1984
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 81 (1) , 20-26
- https://doi.org/10.1063/1.447364
Abstract
The high sensitivity of pulsed‐nozzle, Fourier‐transform microwave spectroscopy has been used to observe the rotational spectra of the isotopic species H234S⋅⋅⋅HF, H2 33S⋅⋅⋅HF, and H2 32S⋅⋅⋅DF of the hydrogen sulphide–hydrogen fluoride complex. The hyperfine coupling constants DHFaa =−236(7) kHz, χaa (33S)=32.785(9) MHz, and χDaa =274(6) kHz, respectively, have thereby been determined together with (B0+C0) and DJ values. The K−1=1, J=2←1 transitions of H2 32S⋅⋅⋅HF, which are very weak because of the low effective temperature of the supersonically expanded gas, have also been detected. Their frequencies, when combined with those of the 202←101 and 101←000 transitions, then allow the spectroscopic constants (B0−C0)=8.768(2) MHz, (B0+C0)=7672.413(2) MHz, DJ =15.10(22) kHz, and DJK =473.3 kHz to be obtained. The values of the various spectroscopic constants have been interpreted in terms of the geometry and internal dynamics of the complex.Keywords
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