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Spectra of methyl cyanide were recorded to analyze interactions in low-lyingvibrational states and to construct line lists for radio astronomicalobservations as well as for infrared spectroscopic investigations of planetaryatmospheres. The rotational spectra cover large portions of the 36$-$1627 GHzregion. In the infrared (IR), a spectrum was recorded for this study in theregion of 2$\nu _8$ around 717 cm$^{-1}$ with assignments covering 684$-$765cm$^{-1}$. Additional spectra in the $\nu _8$ region were used to validate theanalysis.  The large amount and the high accuracy of the rotational data extend to muchhigher $J$ and $K$ quantum numbers and allowed us to investigate for the firsttime in depth local interactions between these states which occur at high $K$values. In particular, we have detected several interactions between $v_8 = 1$and 2. Notably, there is a strong $\Delta v_8 = \pm1$, $\Delta K = 0$, $\Deltal = \pm3$ Fermi resonance between $v_8 = 1^{-1}$ and $v_8 = 2^{+2}$ at $K$ =14. Pronounced effects in the spectrum are also caused by resonant $\Delta v_8= \pm1$, $\Delta K = \mp2$, $\Delta l = \pm1$ interactions between $v_8 = 1$and 2. An equivalent resonant interaction occurs between $K$ = 14 of the groundvibrational state and $K$ = 12, $l = +1$ of $v_8 = 1$ for which we present thefirst detailed account. A preliminary account was given in an earlier study onthe ground vibrational state. From data pertaining to $v_8 = 2$, we alsoinvestigated rotational interactions with $v_4 = 1$ as well as $\Delta v_8 =\pm1$, $\Delta K = 0$, $\Delta l = \pm3$ Fermi interactions between $v_8 = 2$and 3.  We have derived N$_2$- and self-broadening coefficients for the $\nu _8$,2$\nu _8 - \nu _8$, and 2$\nu _8$ bands from previously determined nu4 values.Subsequently, we determined transition moments and intensities for the three IRbands.

journal of molecular spectroscopy

Rotational spectroscopy as a tool to investigate interactions between  vibrational polyads in symmetric top molecules: low-lying states $v_8 \le 2$  of methyl cyanide, CH$_3$CN