Molecular Level Laser Studies Of Condensed Phase Chemistry (The Interface Between Moleculodynamics And Hydrodynamics)

J Lee; S.-B Zhu; G W Robinson

doi:10.1117/12.945452

27 April 1988 Molecular Level Laser Studies Of Condensed Phase Chemistry (The Interface Between Moleculodynamics And Hydrodynamics)

J Lee, S.-B Zhu, G W Robinson

Author Affiliations +

Proceedings Volume 0910, Fluorescence Detection II; (1988) https://doi.org/10.1117/12.945452
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

To extend hydrodynamic concepts to the molecular domain, and thus to use such concepts in the development of accurate rate theories for ultrafast chemical reactions, it must be realized that the relevant friction is a property, not of the solvent alone, but of the complete solute-solvent system. Properties of the solvent in the vicinity of reacting molecules are simply different than properties of the pure solvent. Because of this, a "renormalized" or effective friction must be introduced in place of the shear viscosity of the pure solvent. When this is done, hydrodynamic formalisms are found to be applicable to most experimental data. Past assumptions of "color blind" solvent-solute coupling seem to be the main reason that the moleculodynamic limit has been difficult to attain from the hydrodynamic starting point. A breakdown of ordinary hydrodynamics may still occur for very small (hydrogen-like) reacting particles because of the failure of the equilibrium assumption through the course of the reaction. Both computer molecular dynamics and ultrafast laser experiments are presented in support of these points of view.

Citation Download Citation

J Lee, S.-B Zhu, and G W Robinson "Molecular Level Laser Studies Of Condensed Phase Chemistry (The Interface Between Moleculodynamics And Hydrodynamics)", Proc. SPIE 0910, Fluorescence Detection II, (27 April 1988); https://doi.org/10.1117/12.945452

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