Rotational Spectra of Symmetric Top Molecules in Ground and Different Vibrational Excited States, and Phenomenon of Resonance – Applying in CF3CCH

This paper deals with review of exploration of resonance in symmetric top molecules in different vibrational excited states, vt = n (n =1, 2, 3, 4). Calculations for CF3CCH shows that resonance take place at ( ) ( ) B A A 2A B A x k − − ζ ζ − − + = ll and ( ) ( ) B A A 2A B A x k − − ζ ζ − − + = ll for v10 = 2 and v10 = 3 respectively. In order to account for splitting about 3 MHz for the 2 series in v10 = 4 is necessary to introduce the element 4 2, k J, f k, J, 24 − + l l in fitting program.