Electric dipole moments and nuclear hyperfine interactions for H2S,HDS, and D2S |
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Authors: | R Viswanathan TR Dyke |
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Institution: | Department of Chemistry, University of Oregon, Eugene, Oregon 97403 USA |
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Abstract: | Electric dipole moments and nuclear hyperfine coupling constants for several low-energy rotational states of the ground vibrational state of H2S, HDS, and D2S have been determined by molecular beam electric resonance spectroscopy. Analysis of the Stark effects for radiofrequency spectra of the lowest rotational levels gives dipole moments of 0.978325 (10) D for H2S (J = 1, τ = 0), 0.977294 (20) D for D2S (J = 1, τ = 0), and 0.977484 (60) D for HDS (J = 1, τ = 1 and J = 2, τ = 0). The electric field gradient tensor at the deuterium nucleus, the nuclear spin-spin tensor, and the spin-rotation tensor were evaluated from the hyperfine components of the radiofrequency spectra. The accuracy of these tensors was moderately improved over earlier measurements. From the H2S spin-rotation tensor, the average paramagnetic shielding for the protons was found to be σavp = ?104.84 (40) ppm. Combining this result with the proton NMR absolute chemical shift allowed the average diamagnetic shielding to be calculated as σavd = 135.7 (5) ppm. |
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