Abstract
The rotational spectra of eight isotopic species of the hydrogen-bonded heterodimer H 2S⋯HBr have been investigated by pulsed-nozzle, Fourier-transform microwave spectroscopy. The rotational constant 1 2 ( B 0 + C 0), the centrifugal distortion constant D J , the Br-nuclear quadrupole coupling constant χ aa , and the Br-spin-rotation coupling constant M bb for the vibrational ground state are determined. The spectroscopic constants are interpreted in terms of a heterodimer in which a hydrogen bond is formed from HBr acting as the proton donor and the S atom in H 2S acting as the proton acceptor. The angle between the HBr axis and the extension of the bisector of the angle ∠HSH is determined to be 96.5°.
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