Electric dipole moments and nuclear hyperfine interactions for H 2S, HDS, and D 2S

Abstract

Electric dipole moments and nuclear hyperfine coupling constants for several low-energy rotational states of the ground vibrational state of H 2S, HDS, and D 2S 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 H 2S ( J = 1, τ = 0), 0.977294 (20) D for D 2S ( 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 H 2S spin-rotation tensor, the average paramagnetic shielding for the protons was found to be σ av p = −104.84 (40) ppm. Combining this result with the proton NMR absolute chemical shift allowed the average diamagnetic shielding to be calculated as σ av d = 135.7 (5) ppm.