We have developed Raman gain spectroscopy with femtosecond resolution. The advantage of the method is as follows: (1) There is no disturbance from fluorescence as in spontaneous Raman scattering; (2) The interference of the signal with nonresonant background does not appear. This is extremely advantageous to time-resolved CARS spectroscopy. We have applied this new method to excitons in polydiacetylene (PDA), polythiophenes, and a polyacetylene derivative with only 1.5 ps lifetime. This produces vibrational spectra with the highest time resolution ever reported. Time-resolved resonance Raman spectroscopy has been recognized as a powerful method for studying structures of transient species and electronic excited states. By applying the new methods to a polydiacetylene (PDA) crystal epitaxially grown on a KCl substrate, we could observe Raman spectrum of the exciton state in PDA with only 1.5 ps lifetime.


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    Titel :

    Ultrafast relaxation in conjugated polymers


    Beteiligte:
    Kobayashi, T. (Autor:in)


    Erscheinungsdatum :

    1999-01-01


    Format / Umfang :

    104680 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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