ANOMALOUS BEHAVIOUR IN THE ROTATIONAL SPECTRUM OF THE $V_{8} = 2$ AND 3 VIBRATION FOR THE ${^{12}} CH_{3} {^{13}}C^{15}N$ MOLECULE IN THE FREQUENCY RANGE 17-95 gHz
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Date
1989
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Ohio State University
Abstract
The methyl cyanide molecule was studied in the $v_{8} = 2$ and 3 vibrations, for rotational energy levels with $1 \leqslant J \leqslant 5$ to establish the trend in the energy level in the frequency range 17 to 95 gHz. Anomalous behaviour in the $^{12}CH_{3} {^{13}}C^{15}N$ rotational spectrum of the $V_{8} = 3$ vibration for the $(K=\pm 1) (\ell = \pm 1)$ components with large frequency departures, $=6(J+1) MHz$, from a standard model were investigated to determine what interactions were at play which had been ignorable in ${^{13}}CH_{3} {^{12}}C^{15}N$ molecule. The method of isotopic substitution enabled the molecular system to be ``tuned'' so that resonant interactions could be explored in more detail for each of the molecules. These large departures are explained using a basic molecular model in which accidentally strong resonances (ASR) are at play.
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$^{\ast}$ This work supported in part by grant B-842 of the Robert A. Welch Foundation, Houston, Texas.
Author Institution: University of North Texas; University of Kansas
Author Institution: University of North Texas; University of Kansas