Rare isotopic species of hydrogen sulfide: the rotational spectrum of H₂³⁶S^⋆

¹ Dipartimento di Chimica “Giacomo Ciamician”Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
e-mail: cristina.puzzarini@unibo.it
² Institut für Physikalische Chemie, Universität Mainz, 55099 Mainz, Germany

Received: 20 December 2013
Accepted: 17 March 2014

Abstract

The rotational spectrum of the ³⁶S-bearing isotopologue of hydrogen sulfide (H₂S) has been investigated for the first time in the 167 GHz−1.6 THz frequency range, thus providing an accurate and reliable set of spectroscopic parameters. The experimental investigation was backed up by state-of-the-art quantum-chemical calculations, which also allowed us to demonstrate the incorrectness of the previously reported spectroscopic constants. The present results are of suitable accuracy to attempt the astrophysical detection of the isotopic species under consideration. Finally, reliable predictions for the spectroscopic constants of other rare isotopologues of H₂S, namely the mono- and bi-deuterated species containing ³³S and ³⁴S, are provided.