Femtosecond Relaxation Dynamics of Large Molecules

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Abstract
The ultrafast relaxation in solution of two large organic molecules, malachite green and nile blue 690, has been investigated with the equal-pulse correlation technique. In addition to previously known picosecond processes, we have observed fast initial exponential decays (less than 100 fs) and damped sinusoidal oscillation over intermediate time delays. We believe that the latter behavior, the first such decay observed on a femtosecond time scale for any material, represents quantum beats.