We report fluorescence line-narrowing experiments on low-temperature molecular crystals composed of hydrogen bonded dimers of benzoic acid. The results indicate that the acid protons are distinctly delocalized in nearly symmetric double-well potentials. The tunneling frequency is 4.8 × 109 s−1, a quantity not previously measured for acid protons. This is the first observation of delocalized protons of acid dimers in the condensed phase.
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Hochstrasser et al. (1987) studied this question.
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