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Microwave Double Resonance Investigation of Rotational Relaxation of Methyl Iodide-d3

Abstract For a study of rotational relaxation of methyl iodide, CD3I, the method of microwave modulated four-level double resonance has been used. The manifold of the J = 1,2 and 3 levels has been investigated and the η-values have been determined. An experimental procedure to overcome disturbancies produced by the dynamic Stark-effect is described. The sign of the η-values is interpreted in terms of first order dipole and quadrupole type rate constants. The experimental results are in accordance with theoretical results of Rabitz et al. Further a derivation of collisional selection rules for molecules with a nuclear quadrupole moment is given