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 solution^1,2. In this work we extend this technique tο 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. 95ps, only 55% longer than fie free rotor rotational time (0. 61 ps).

© 1990 Optical Society of America