Abstract
The millimeter wave spectrum of propynal, HCCCHO, has been studied in the ground vibrational state. A detailed centrifugal distortion analysis has been carried out on the combined data of newly assigned millimeter wave rotational transitions (up to 200 GHz) together with the microwave transitions reported earlier. A total of 90 transitions as high as J = 20 and K = 12 could be fitted with a standard deviation of 87 kHz. This analysis yielded a complete set of ground state rotational and centrifugal distortion constants. The rotational constants are in MHz: A = 68 035.2994 ± 0.0429, B = 4826.3014 ± 0.0073, C = 4499.5107 ± 0.0069.
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