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l-Type Doublet Transitions of the Rare Stable Isotopic Species of Hydrogen Cyanide, HCN

l-type doublet transitions for HCN molecules in the first excited bending state 0110 have been measured for the isotopic species H13C14N, H12C15N, H13C15N, D13C14N, D12C15N and D13C15N. The measurements improve and complete the set of available coupling constants of the vibrationrotation interaction in this bending mode. All known l-type coupling constants are collected and compared with those obtained from the l-type splitting of the rotational lines and those obtained from ab-initio calculation of the energy hypersurface.