Knowledge Bank

Previous studies of the parallel bands $2\nu 2$ and $2\nu 5\mathrm{<mrow\; data-mjx-texclass="ORD">0</mrow>}$ by the two first authors have been completed by the analysis of the weaker perpendicular band $\nu 2+\nu 5$, centered near 2745 $cm-1$, which was recorded using the Littrow instrument of the University of Tennessee. It is well known, that the $v2=1$ and $v5=1$ states of methyl-bromide are linked by a x-y type Coriolis interaction. Therefore, in the 2500-2900 $cm-1$ range, the levels $(v2=2),(v5=2,\ell 5=0),(v5=2,\ell 5=\pm 2),(v5=v2=1,\ell 5=\pm 1)$ are linked by a similar interaction. Least squares and prediction programs have been written to treat such problems and they have been satisfactorily applied to both isotopic species $CH3\mathrm{<mrow\; data-mjx-texclass="ORD">7</mrow>}9Br$ and $CH3\mathrm{<mrow\; data-mjx-texclass="ORD">8</mrow>}1Br$.