Absorption spectrum of the 2600 Å transition of benzene in cryogenic liquids

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Abstract
Absorption spectra of the 2600 Å system (1B2u←1A1g) of benzene dissolved in cryogenic liquids N2, CO, CF4, CH4, NF3, C2H6, and C3H8 are obtained and reported. As in the gas phase spectrum, the dominant series is the vibronically induced 610 10n (n = 1,⋅⋅⋅,5). No rotational or hot band structure has been observed in any of the solvents. The following features have been identified in the spectra: 6101n0, 620, 610810ln0, 6109101n0, 6108109101n0, and 6107101n0. In addition, N2, Co, CF4, NF3, and CH4 induce the (0,0) and 110 transitions while C2H6 and C3H8 induce 6101n0 and 620. Linewidths range from 50 cm−1 (N2) to 250 cm−1 (C3H8) and are temperature independent for a given solvent. Gas to liquid shifts are found to vary from −250 to −300 cm−1 throughout the series of solvents used and to be temperature independent. Solvent perturbations are in general unique and characteristic of particular solvents.