The Measurement of Bond Moments and Derivatives in HCN and DCN from Infrared Intensities

摘要

The absolute infrared absorption intensities of the fundamental vibrations of HCN and DCN have been measured, using the pressure broadening technique. These measurements yield the bond moments mgr;Csngbnd;H=plusmn;1.13d, mgr;Ctrpbnd;N=plusmn;1.80d and show that if C is positive in the Ctrpbnd;N dipole, H is positive in the Csngbnd;H dipole. The change in moment with internuclear distance is found to be part;mgr;/part;rCsngbnd;H=plusmn;1.05d/A, part;mgr;/part;rCtrpbnd;N=mnplus;0.66d/A. Two of the three anomalous peaks in the band ngr;1of HCN are shown to arise from the dimer of HCN.