Dynamics of Photoisomerization
There has recently been a good deal of theoretical [1–3] and experimental [4–7] interest in activated barrier crossing processes in liquids. The best known model is that of Kramers  who derived expressions for the escape of particles over a barrier in various limiting cases. Combining Kramers ideas with recent kinetic theory calculations [1–3] leads to the following general picture. At low friction (viscosity) the rate of barrier crossing increases with viscosity (inertial region) until it turns over and begins to decrease with increasing friction (intermediate friction). Finally at high friction values the rate decreases linearly with increasing friction (Smoluchowski limit region).
KeywordsState Isomerization Rotational Diffusion High Repetition Rate Twisted Form Rotational Diffusion Coefficient
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