Abstract
Rotational transitions in vibrational states v 5 = 1 and v 11 = 1 in the oblate CH 3 C 35 Cl 3 molecule have been studied at frequencies from 69 to 332 GHz. The two states belong to the second lowest wavenumber A-symmetry, and E-symmetry normal modes, and are accidentally very close in energy. They are thus strongly coupled by ( x - y ) Coriolis interaction, in addition to the l-type resonance in the degenerate v 11 = 1 state. The resulting rotational transitions form three characteristic band series, which show many manifestations of strong interstate coupling. Frequencies of well over 1000 transitions have been measured and fitted to within experimental accuracy, resulting in Δ E 5 , 11 = 2.41204 ( 3 ) cm −1, first values of the axial constants for this molecule, C 5 = 1709.966 ( 7 ) , C 11 = 1712.462 ( 7 ) MHz, and of values for the pertinent Coriolis coupling coefficients, ζ 11 c and ζ 5 , 11 b , which are in good agreement with results of ab initio calculations.
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