Advances in Multi-Photon Processes and Spectroscopy

The following sections are included:

• Preface

• Contents

The following sections are included:

• Introduction

• Symmetric triatomic molecules and ions
  • Carbon disulfide
    • Emission polarization and rotational lineshapes in vapor
    • Electronic dephasing in solution
  • Sulfur dioxide
  • Triiodide ion

• Other small photodissociative molecules
  • Alkyl iodides
  • Nitromethane

• Small linear polyenes
  • Trans-hexatriene
  • Cis-hexatriene
  • Butadiene

• Stilbene
  • Trans-stilbene
  • Cis-stilbene

• Charge transfer systems
  • Hexamethylbenzene/tetracyanoethylene complex
  • Covalent charge-transfer molecules

• Azulene

• Conclusions

• Acknowledgments

• References

The following sections are included:

• Introduction
  • Experimental principle

• Reaction in van der waals complexes
  • Preparation of the complex
    • The entrance channel
    • The final states
    • The intermediate state of reaction

• The van der Waals technique as a probe for a harpoon type chemical reaction.

• Two-photon excitation

• VUV excitation of the Xe-Cl₂ complex: symmetry selection on the exit channel
  • Charge transfer mechanism in a collinear Xe-Cl₂ complex
  • Charge transfer mechanism in a T shaped Xe-Cl₂ complex

• Femto second investigation of the Xe-Cl₂ reactive complex (73)

• Reaction in ionic complexes
  • Ionic nucleophilic substitution reaction in halogenated benzene- NH₃ complexes
  • Results

• Size effect in nucleophilic substitution

• Conclusions

• References

Some recent theoretical studies on photon-induced fragmentation in weakly bound complexes of the van der Waals type are reviewed. The Ar…I₂ complex, where competition between electronic and vibrational predissociation has been studied both theoretically and experimentally, is the prototype system chosen.

Recent developments of off-resonant higher-order, fifth and seventh order, nonlinear spectroscopy in liquids are reviewed. Vibrational spectra in both low- and high-frequency regions are studied by these techniques to obtain microscopic information of liquids. Vibrational dephasing is theoretically described with emphasizing its relation to liquid dynamics. A brief introduction of nonlinear spectroscopy is given. A couple of different higher-order nonlinear techniques, Raman echo, temporally two-dimensional impulsive stimulated Raman scattering, and one- and two-dimensional overtone dephasing, are discussed together with conventional third order nonlinear techniques such as coherent anti-Stokes Raman scattering and femtosecond optical Kerr effect.