Abstract

The rotational spectrum of the 36 Ar⋯ H 35 Cl isotopomer of the Van der Waals dimer between an argon atom and a hydrogen chloride molecule has been observed in natural abundance with a molecular beam, cavity Fourier transform microwave spectrometer. The derived spectroscopic constants are compared with those redetermined for 40 Ar⋯ H 35 Cl and 40 Ar⋯ H 37 Cl , which have been obtained from new measurements of all rotational transitions below 19 GHz and a new data analysis inclusive of chlorine spin–rotation and hydrogen-chlorine spin–spin effects.

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