Abstract
Transitions in the ν 4 and ν 6 bands of D 2CO have been recorded by means of an infrared-microwave two-photon spectometer. The two-photon frequencies have been combined with frequencies obtained by infrared laser Stark and microwave spectroscopy to obtain rotational and centrifugal distortion constants for the ground, ν 4, and ν 6 states as well as vibrational frequencies and the Coriolis coupling constant for the two excited states. Expressions are reported for the linestrengths of two-photon transitions for an asymmetric rotor for the cases of parallel and perpendicular orientation of the planes of polarization of the infrared and microwave radiation.
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