Abstract
The absorption spectrum of CD3H has been investigated under high resolution in the photographic infrared with absorbing paths of up to 7 m atmos obtained by multiple reflection. Two simple parallel bands were observed at 8870A and 11590A. The K structure in the former was clearly resolved. The rotational structure of the two bands was analyzed yielding B0=3.2787±0.0010cm−1. On the assumption of tetrahedral symmetry for the CD3H molecule this value leads to a C–H distance r0=(1.09193±0.00017)×10−8cm. This value is compared with the corresponding values obtained by other authors from studies of CH4 and CH3D.

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