Abstract
The υ4 + υ11 (Eu) infrared band of C2D6 has been rotationally analysed under high resolution, between 1195 cm-1 and 1335 cm-1, taking into account the x,y Coriolis coupling with υ2 + υ4(A1u. The rotational structure is affected by strong l-type interactions, with both Δl = Δk = ±2 and Δl = plusmn;2, Δk = ±1. Torsional splittings are not resolved, as expected. Several Q branches of the hot band (2υ4 + υ11)- υ4 have been identified, and some of them occur as narrow features with unresolved J structure, due to the l-interaction mechanisms. The hot RQ1 and RQ2 are so sharp that the maxima of the torsional components can be resolved, and a splitting of about 0·015 cm-1is measured. This value, apparently too small, is in agreement with the fact that υ11 in 2υ4 + υ11 is not a pure E2d vibrational mode, due to the γ Coriolis coupling mechanisms in the CD3 deformation vibration–torsion system.
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