Microwave rotational components of the $nu_{9}$ =1 and $nu_{10}$=2 vibrational modes of $^{13}CH_{3}$CCH molecule in the range 16-50 GHz

Abstract

Some rotational components have been measured in the ground, the $nu_{9}$ =1 and the $nu_{10}$=2 vibrational states for $^{13}CH_{3}$CCH isotopic species in the frequency range 16- 50 GHz. A set of rotational constants has been determined, which gives the best fit between the observed and the calculated frequencies for each vibrational state. A Fermi resonance was found between these two states.