The concentration dependence of the shape of absorption bands in the spectrum of CF_4 in liquid argon is studied in the concentration range (0.01-17) * 10~(-3) molar fractions at 93 K. In all spectral regions related to ν_3, the shape of the spectral function is determined, along with the Fermi resonance <ν_i, ν_3 + 1, ν_4| ≈ <ν_i, ν_3, ν_4 + 2|, by the resonance dipole-dipole interaction. In the spectral region of the Fermi doublet ν_1 + ν_3 ≈ ν_1 + 2ν_4, the spectrum of the contact (CF_4)_2 dimer is identified. Agreement between this spectrum and the calculated spectrum is achieved by simultaneously taking intramolecular and intermolecular resonances into account. The distance R_(C-C) in the dimer is 4.85 (15) A. The calculations of the spectra of (~(12)CF_4)_2 and (~(13)CF_4-~(12)CF_4) dimers with this value of R_(C-C) in the region ν_3 ≈ 2ν_4 agree with the experiment.
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