# 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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 Title: 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 Creators: Al-Share, M.; Tam, H.; Roberts, J. A. Issue Date: 1989 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. URI: http://hdl.handle.net/1811/17949 Other Identifiers: 1989-TC-5