A hole-burning experiment has been performed on the phenol-(H2O)2 complex formed in a supersonic expansion. The lowest energy S1 state absorption of this complex consists of a 25 cm−1 wide band with unresolved structure. This structure is shown to be due to vibronic transitions of a single isomer, all originating from the same ground state level. The band has been fit with a series of Gaussian peaks revealing the existence of vibrational frequencies which are surprisingly low for a hydrogen-bonded complex.
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Lipert et al. (1989) studied this question.
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