(12)CH3(12)CD3: The coriolis resonating triad nu(4), nu(10), nu(11)

The spectrum of (CH3CD3)-C-12-C-12 has been recorded at a resolution of 0.004 cm(-1) in the region between 950 and 1200 cm(-1). About 4500 vibration-rotation transitions were assigned and simultaneously analysed in terms of the upsilon(4)=1 (A(1)), upsilon(10)=1 (E), and upsilon(11)=1 (E) strongly Coriolis interacting states. Precise values of the upper state spectroscopic parameters and of the Coriolis interaction parameters have been obtained. The identification of a large number of <<forbidden>> transitions, and the observation of <<allowed>> transitions up to high J and K, led to the determination, for the first time, of the k-dependent ground state parameters A(0), D-K(0), and H-K(0), together with H-JK(0) and H-KJ(0).