The Rotational Spectrum of Monothioformic Acid. III. Dipole Moment and Relative Intensity Measurements1,2
Open Access
- 1 August 1976
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 31 (8) , 995-1001
- https://doi.org/10.1515/zna-1976-0820
Abstract
The molecular electric dipole moment of each of the two planar thiol rotamers of monothio-formic acid, in its ground state, has been determined from Stark effect measurements. The results are for cis-HC(:O)SH: μa=1.805(1) D, μb = 2.228(1) D and μ=2.868(1) D; whereas for trans-HC(:O)SH: μa = 1.366(1) D, μb = 0.702(1) D and μ = 1.536(1) D. Additional Stark effect measurements on HC(:O)SD and DC(:O)SH have yielded the direction of the dipole moment in each rotamer. The energy difference between the ground vibrational states of cis-and trans-HC(:O)SH has also been determined by relative intensity measurements. The cis rotamer is found to lie at higher energy than the trans rotamerb y 2767(7) J·mol-1 (231.3(6) cm-1 or 661.3(17) cal·mol-1).Keywords
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