The microwave spectrum of cyanoacetylene in ground and excited vibrational states

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Abstract
Microwave transitions are reported for ten isotopic species of cyanoacetylene in the ground, v 4, v 6, v 6 and v 7 vibrational states in the region 26·5-40·0 GHz. In addition millimetre-wave transitions of HCCCN and DCCCN in the ground v 5, v 6 and v 7 vibrational states in the region 54·5-211·8 GHz have been measured. The combined data have been analysed to yield Bv, Dv, γrs, γltlt′ and qt vibration-rotation parameters, for HCCCN and DCCCN. In addition millimetre-wave measurements pertaining to the v 6 + v 7 and v 5 + v 7 vibrational states have been analysed to give values for rtt′J and approximate values of gtt′ and rtt′ (t = 5, 6; t′ = 7). Rotational constants Bv in the first excited state of the fundamental vibrations v 4, v 5, v 6 and v 7 are combined with infra-red values for v 1, v 2 and v 3 to give Be for both HCCCN and DCCCN.