Knowledge Bank

The microwave spectrum of methyl hypochlorite has been studied in the region from 8,000 KMc. to 37,000 KMc. and from 49,000 KMc. to 60,000 KMc. Due to the instability of the sample, the vapor was flowed through the wave guide which was always maintained at dry ice temperature. Both \emph{a} and \emph{b}-type transitions were identified and from these the rotational constants for the isotopic species $CH3OCl35$ are: A=42,064.10 Mc., B=6,297.06 Mc., and C=5,670.42 Mc. The asymmetry parameter, $\kappa$, is --0.96556. From a study of the hyperfine structure of the low J transition one can obtain the quadrupole coupling constants. With respect to the principal axis system these constants are: for $Cl35$, $eQ\partial 2V\partial Zm2=--84.0$ Mc. And $\eta =0.408$; for $Cl37,eQ\partial 2V\partial Zm2=--67.0$ Mc. Lines due to the isotopic species $CH2OCl37$ have also been assigned.