ChemInform Abstract: VISCOSITY DEPENDENCE OF THE ROTATIONAL REORIENTATION OF RHODAMINE B IN MONO- AND POLYALCOHOLS. PICOSECOND TRANSIENT GRATING EXPERIMENTS

Autor:	Michael D. Fayer, R. S. Moog, Mark Ediger, Steven G. Boxer
Rok vydání:	1983
Předmět:	Rhodamine Viscosity chemistry.chemical_compound chemistry Picosecond Rhodamine B General Medicine Boundary value problem Slip (materials science) Physics::Chemical Physics Grating Rotation Molecular physics
Zdroj:	Chemischer Informationsdienst. 14
ISSN:	0009-2975
DOI:	10.1002/chin.198310065
Popis:	Rotational reorientation times (Tau/sub ROT/) were obtained for rhodamine B in a series of n-alcohols and polyalcohols of varying viscosities by a transient grating technique. The general trend of the Debye-Stokes-Einstein (DSE) theory was shown to extend to much higher viscosities than previously reported. Detailed analysis of the results suggests that the n-alcohols and polyalcohols provide two distinct hydrodynamic boundary conditions for the rotating species. In the n-alcohols, stick boundary conditions are observed, while the polyalcohols provide approximately slip boundary conditions. The question of a difference in the rotation times for the ground and excited electronic states is addressed and an upper bound is placed on this difference for rhodamine B. 7 figures, 1 table.
Databáze:	OpenAIRE
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