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)

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.

Keywords

Crystallization Furnace Naphthalene Tate Cola 

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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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