Millimeter-wave rotational spectra of the symmetric top molecule CF3CCD have been measured in its ground and excited vibrational states, v10 = 1. Analysis of the ground-state spectra gave the following rotational parameters: B0 = 2696.06753 MHz, DJ = 0.22759 kHz, DJk = 6.1748 kHz. HJk (16.1 mHz) and HkJ (−0.243 mHz) were determined for the first time. In the v10 = 1 state, l = ±1 series have been assigned and spectroscopic parameters were obtained accurately: B1 = 2701.26211 MHz, qt+(2,2) = 3.30887 MHz, Aζ = 3263.93 MHz. The off diagonal parameter rt (0.152 MHz) was determined for the first time.
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