Rotational Relaxation in Rigid Media by Polarized Photoselection
| Autor: | John R. Lombardi, J. W. Raymonda, A. C. Albrecht |
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| Rok vydání: | 1964 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 40:1148-1156 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1725264 |
| Popis: | A study is made of the rotational relaxation of solute molecules in media ranging in viscosity from 106 to 1012 P. Viscosities are determined for various mixtures of 3‐methylpentane and isopentane at 77°K The solute relaxation is observed by two distinctly different methods both based on polarized photoselection. At the high viscosities a dichroism is produced by polarized photochemistry and the rotational relaxation is followed by monitoring the collapse of the dichroism. At lower viscosities the steady‐state depolarization of long‐lived phosphorescence is observed. The latter technique is completely analogous to previous work at much lower viscosities where the depolarization of fluorescence is measured. A theory is presented which links the general photoselection equations to proper solutions of the rotational diffusion equation for an isotropic body. The theory is in a form which permits a variety of relaxation studies where solute molecules may be photoselected along different combinations of molecul... |
| Databáze: | OpenAIRE |
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