The FT absorption spectrum of ¹³CH¹²CH (II): rotational analysis of the range 9500 to 10000 cm⁻¹

Abstract

The infrared spectrum of ¹³CH¹²CH has been recorded in the 9500–10000 cm⁻¹ wavenumber region by Fourier transform spectroscopy. Twelve Σ⁺–Σ⁺ and one ‘perturbation allowed’ Δ–Σ⁺ cold bands, and four Π–Π hot bands have been identified. All these bands have been rotationally analysed and vibrationally assigned. They mainly involve triple excitations of the CH stretching modes. The relative intensities have been measured. Local interaction patterns are identified and discussed. Line wavenumbers from the two strongest bands observed in the range are listed.

Acknowledgements

This work was sponsored, in Italy, by the University of Bologna and MIUR (PRIN « Dinamiche molecolari ») and, in Belgium, by the Fonds National de la Recherche Scientifique (FNRS, contracts FRFC) and the « Action de Recherches Concertées de la Communauté française de Belgique ». It is performed within the ‘LEA HiRes’ collaboration between ULB and UCL and was earlier supported by a bilateral scientific collaboration between the « Communauté française de Belgique » and FNRS (Belgium) and Italy.