Knowledge Bank

The rate constant for radiationless transitions is expressed in terms of a correlation $function.1$ The time dependent correlation function is computed for a series of hydrocarbons and their derivatives. Special attention is paid to the validity of the statistical limit and the effect of geometrical distortions. For instance out of plane vibrations of the amino group can be made responsible for the relative short phosphorescence lifetime and the strong energy dependence of the intersystem crossing $rate.2,3$.