Measurement of Bond Moments in C2H2 and C2D2 from Infrared Intensities

Abstract
The absolute infrared absorption intensities in the active bending vibration ν5 in C2H2 and C2D2 have been measured using the extrapolation method of Wilson and Wells. The intensities observed are A5(C2H2) = 2170×1010 cycles/sec cm at NTP and A5(C2D2) = 1040×1010 cycles/sec cm at NTP. These values indicate the bond moment associated with the CH and the CD bonds are μCH=0.999±0.035 debye and μCD=0.941±0.033 debye, respectively.
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