Vibrational Relaxation in Doped and Pure Molecular Crystals A Picosecond Photon Echo and CARS Study

  • W. H. Hesselink
  • B. H. Hesp
  • D. A. Wiersma
Conference paper
Part of the Springer Series in Chemical Physics book series (CHEMICAL, volume 14)


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.


Vibrational Relaxation Phonon Emission Frenkel Exciton Exchange Narrowing Phase Relaxation Time 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • W. H. Hesselink
    • 1
  • B. H. Hesp
    • 1
  • D. A. Wiersma
    • 1
  1. 1.Picosecond Laser and Spectroscopy Laboratory, Department of Physical ChemistryUniversity of GroningenGroningenThe Netherlands

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