Manifestation of Resonance Dipole-Dipole Interaction in Spectra of Low-Temperature Molecular Mixtures of C_2F_6 in CF_4 and CF_4 in C_2F_6

摘要

We have measured IR absorption spectra of solutions C_2F_6 in CF_4 (T = 178 K) and CF_4 in C_2F_6 (T = 173 K) in the overtone range of the spectrum. We have studied how the resonance dipole-dipole interaction affects the formation of contours of bands that correspond to transitions to states involving the vibrations v_(10)(C_2F_6) and v_3(CF_4), which are strong in the dipole absorption. For the system C_2F_6 in liquid CF_4, the state v_2 + v_(10)(C_2F_6) resonantly interacts with the state v_2(C_2F_6) + v_3(CF_4), and, for the system CF_4 in liquid C_2F_6, the state v_1 + v_3(CF_4) resonantly interacts with the state v_1(CF_4) + v_(10)(C_2F_6). The contours of the bands v_2 + v_(10) (C_2F_6) in the spectrum of the mixture with CF_4 and of the bands v_1 + v_3(CF_4) in the spectrum of the mixture with C_2F_6 have been calculated.