Lability of the Configuration of Free Complex Molecules and Polarized Luminescence

We compare the sensitivity of the degree of polarization of integral fluorescence for excitation by light with a spectral width larger than the width of the rotating loop or only in the Qbranch of the rotating loop to a change in the principal moment of inertia (rotational constants) of complex molecules in vapors. It is shown that the sensitivity depends on the degree of asymmetry of the molecular top and the intramolecular orientation of the dipole transition moments. Improvement of the symmetry of the asymmetric top leads to an increase in the sensitivity to at least one of the rotational constants. Such effects are also noted for the sensitivity of the period of the rotational quantum echo to a change in the rotational constants.