Femtosecond study of self-trapped vibrational excitons in crystalline acetanilide

J. Edler, Peter Hamm, Alwyn C. Scott

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    Femtosecond IR spectroscopy of delocalized NH excitations of crystalline acetanilide confirms that self-trapping in hydrogen-bonded peptide units exists and does stabilize the excitation. Two phonons with frequencies of 48 and 76 cm(-1) are identified as the major degrees of freedom that mediate self-trapping. After selective excitation of the free exciton, self-trapping occurs within a few 100 fs. Excitation of the self-trapped states disappears from the spectral window of this investigation on a 1 ps time scale, followed by a slow ground state recovery of the hot ground state within 18 ps.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number6
    Pages (from-to)067403
    Publication statusPublished - 2002

    Bibliographical note

    Copyright (2002) American Physical Society


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