Knowledge Bank

A computer $program1$ has been designed for the calculation of molecular vibration-rotation energy levels and eigenvectors for the case of first-order Coriolis resonance between a parallel band and a perpendicular band in molecules with symmetry $C3v$. A previously presented computer $program2$ in which one-parameter analyses were described has been refined by including further second-order terms. This refinement not only retains the localization of the perturbation within a given subband but also allows for a better fit to the experimentally observed perturbations in adjacent subbands. A perturbation in $\nu 3+\nu 4$ of $CH3F$ observed by $Blass3$ will be used as an illustration under the assumption that it is due to a Coriolis resonance with a nearby parallel band. Supported in part by the National Science Foundation. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ R. L. Dilling and P. M. Parker, Bull, Am. Phys. Soc. 11, 41 (1966). $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ R. L. Dilling and P. M. Parker, Bull, Am. Phys. Soc. 11, 311 (1966). $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ W. E. Blass, Thesis, Michigan State University (1963).