Laboratory Detection and Rotational Rest Frequencies of N[CLC]a[/CLC]SH

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Abstract

The first laboratory spectrum of sodium hydrogensulfide, NaSH, is observed in the millimeter- and submillimeter-wavelength regions by direct absorption spectroscopy. The NaSH molecule is produced in a DC glow discharge plasma of a gaseous mixture of sodium, hydrogensulfide, and argon. A total of 100 a-type rotational transitions with Ka<10 in its ground state is measured in the frequency range 230-395 GHz. The spectrum of an isotopic species, NaSD, is also observed to confirm our identification of the species. The observed spectral lines are analyzed with a Hamiltonian for asymmetric top molecules, and the rotational, centrifugal distortion, and higher-order centrifugal distortion parameters for NaSH and NaSD are accurately determined. The r0 structure of NaSH is derived from the observed rotational constants of NaSH and NaSD: r0(Na—S) = 2.478(2) Å, r0(S—H) = 1.396(7) Å, bond angle Na—S—H = 92(1) degrees, with 1 s.d. values in parentheses. The observed molecular constants produce accurate transition frequencies for NaSH in the millimeter-wavelength region and thereby enable the searches for these lines in interstellar and circumstellar sources with radio telescopes.

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