Microwave Spectrum of Formaldehyde I. K-type Doubling Spectra

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Abstract
Microwave spectral lines for the direct transitions between the K -type doublets were measured from 3 kMc to 40 kMc for H 2 CO and for its isotopically substituted molecules HDCO, H 2 C 13 O and H 2 CO 18 . The observed spectra and the previously reported data for H 2 CO were analyzed by a digital computer by the use of Kivelson and Wilson's method for the centrifugal distortion correction. The asymmetry parameter b and B – C were obtained for each isotopic species as follows:
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