Dipole moment measurements for the 100 and 011 excited vibrational states of HCN are presented. These, and previously measured, dipole moments are combined with infrared intensity measurements to obtain dipole moment functions for HCN in both normal and internal coordinate systems. The dipole moment results are lang;thinsp;mgr;rang;100=2.980thinsp;53(6), lang;thinsp;mgr;rang;011=2.976thinsp;9(7), and mgr;e=3.016 D. The first dipole derivatives with respect to normal coordinates, from IR intensities, are mgr;1=+0.0029, mgr;2=+0.178, and mgr;3=+0.1111 D. These results plus the vibrational dependence of the dipole moments give the following second derivatives: mgr;11=minus;0.003thinsp;38, mgr;22=minus;0.0251, mgr;33=+0.0012 D. Dipole moments of several states of DCN are calculated and are in excellent agreement with experimental results.
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