Abstract
Stochastic theories based on the Langevin or Fokker-Planck equations for describing chemical reactions break down when fluctuations associated with collisions no longer look completely random. This occurs on the picosecond or femtosecond timescale, and consequently, new general dynamical theories for explaining fundamental processes in chemical reactions are needed for ultrafast timescales. The breakdown of stochastic descriptions will be illustrated experimentally and several alternative theoretical approaches for ultrafast phenomena will be discussed.
© 1986 Optical Society of America
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