The millimeter-wave rotational spectrum of CF3CCD in the excited vibrational state v10=2

The millimetre-wave rotational spectra of the excited vibrational state v(10) = 2 of the symmetric top molecule, CF(3)CdropCD, have been recorded for J" = 12 up to J" = 25. The l = +/-2 and l = 0 series have been assigned and the spectra analysed to give rotational parameters including x(ll) = 7716.975 MHz. The main interactions between states of different l are the r(t) (2, -1) = 0.158 MHz and q(t)(+)(2, 2) = 3.308 MHz. Two type of l-resonance are identified, one of which is due to an avoided crossing between the 1 = 0 and 1 = +2 series. The spectra are qualitatively similar to the corresponding ones of CF(3)CdropCH. (C) 2003 Elsevier Inc. All rights reserved.