MICROWAVE AND MILLIMETER WAVE SPECTRA OF SOME NITRILE OXIDES

Abstract

The millimeter wave spectrum of HCNO was observed between 40 and 400 GHz. For each rotational transition observed up to J = 11 $\rightarrow$ 12 an assignment of 17 vibrational satellites is possible, and some derived vibration rotation interaction constants will be discussed. In addition, four rotational transitions of pivalonitrile oxide have been found between 26 and 40 GHz and assigned. As anticipated from the work on HCNO, ($CH_{3}) = C- C \equiv N - O$ shows the spectrum of a symmetric top with a linear arrangement of the heavy atmos $\equiv C-C\equiv N-O$. Each rotational transition of pivalonitrile oxide shows two remarkable features: a) Due to a low lying bending mode ($v_{1} = 7$ can be observed at $-35^{\circ} C$. b) Each subtransition can be resolved into its K-substructure and l-type components. Preliminary grounds state constants are: $B_{o} = 1459.19$ MHz and $D_{jk} = 12.88$ kHz.