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

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. [ABSTRACT FROM AUTHOR]