Abstract
The study of rotational dynamics of molecules in solution is a source of valuable information on the forces that mediate intermolecular interactions. Fluorescence anisotropy decay has been used to probe the rotational dynamics of large molecules in solution1,2. In this work we extend this technique to study small molecules in solution, into the uv and into the femtosecond range. The experimental anisotropy decay for aniline/isopentane solution was obtained by upconverting the uv fluorescence of aniline molecules and is presented in Figure 1. An exponential fitting yielded a rotational decay time of 0.88ps, only 44% longer than the free rotor rotational time (0.61 ps).
© 1990 Optical Society of America
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