Manifestation of the resonance interaction between transition dipole moments in the IR spectrum of CF4 solutions in liquid argon

The IR absorption spectra of liquid CF4 and its mixtures with argon are obtained at 93 K in various cryostats with optical path lengths from 100 mm to 200 μm for concentrations from 10-5 mol/mol to a pure CF4 liquid. The spectral moments of the v1 + v3, v3 + v4, and 2v3 bands are measured. It is shown that the resonance interaction between transition dipole moments in regions of the fundamental transition and of the states combined with v3 is determined by the same matrix elements. A method for calculating spectral moments caused by this interaction is proposed. The linear dependence of the second spectral moment on the concentration of impurity centers was observed. The presence of the positive third spectral moment is proved to be related to cooperative interaction between solved molecules. The complex structure of a number of bands is explained by the presence of the Evans holes. 12 refs., 12 figs., 4 tabs