Abstract
Using picosecond photon echoes a detailed study has been made of vibrational relaxation in the system pentacene in naphthalene at 1.5 K. The results indicate that low-frequency modes relax directly through phonon emission, while higher frequency modes decay through vibrational cascading. The role of the medium on the anharmonic intra-molecular vibration-vibration coupling is emphasized.
Delayed picosecond CARS experiments have been used to study relaxation of Frenkel-type vibrational excitons in pure naphthalene. The Raman line- shapes of these excitons are found to be Lorentzian and evidence is presented that this is caused by vibrational exchange narrowing.
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Hesselink, W.H., Hesp, B.H., Wiersma, D.A. (1980). Vibrational Relaxation in Doped and Pure Molecular Crystals A Picosecond Photon Echo and CARS Study. In: Shank, C.V., Hochstrasser, R., Kaiser, W. (eds) Picosecond Phenomena II. Springer Series in Chemical Physics, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87861-9_29
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DOI: https://doi.org/10.1007/978-3-642-87861-9_29
Publisher Name: Springer, Berlin, Heidelberg
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