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Surface enhanced Raman spectra of Phenylalanine (Phe) in Ag colloidal solution have been recorded for Phe solutions at different pH. Spectral line-shape analyses of three enhanced modes have been carried out between pH 4.5 and 10.5. The variation of line-width with pH reveals two mechanisms in solution: (i) the fluctuation of pH in microscopic volume and (ii) the motional narrowing caused by the intermolecular...
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