Semiclassical description of the nonlinear response of self-trapped vibrational excitations.

A simple description of the nonlinear response of self-trapped NH-stretch excitations is obtained by treating the NH-stretch modes as quantized, but the hydrogen bonds as classical modes. This approach provides both an intuitive picture of the self-trapping dynamics and a semiquantitative description of the experimentally observed transient-absorption spectrum. [ABSTRACT FROM AUTHOR]