SUBMILLIMETREWAVE SPECTROSCOPY OF THE PURE ROTATIONAL TRANSITIONS IN THE UPSILON-6 = 1 VIBRATIONAL-STATE OF (CH3F)-C-12

The DELTA-J = + 1, DELTA-K = 0, DELTA-l = 0 pure rotational transition frequencies were measured in the double degenerate upsilon-6 = 1 vibrational state of (CH3F)-C-12 up to J less-than-or-equal-to 11 (609 GHz) using a submillimetrewave-microwave RAD spectrometer with acoustic detection. The determinable parameters of the effective rotational Hamiltonian for the degenerate vibrational state of symmetric top molecules were fitted with respect to all available microwave and submillimeterwave transition frequencies.