Abstract
Direct l doublet transitions have been observed for the 01 10 state of the 35Cl 12C 14N and 37Cl 12C 14N isotopic species of cyanogen chloride and the 79Br 12C 14N and 81Br 12C 14N isotopic species of cyanogen bromide in the frequency range 4–22 GHz. The l-doubling constants ( q 0, q 1, q 2) and the asymmetry parameters ( ηeQq z ) of the halogen nuclear quadrupole coupling tensors have been derived. The constants q 1 have been calculated form the vibrational force fields of Whiffen for the four cyanogen halides using the formulation of Watson. Agreement with the observed values is found to be 10% or better and for cyanogen fluoride and cyanogen chloride the isotopic shifts in q 1 are also well predicted.
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