Fine structure in the dependence of final conditions on initial conditions in classical collinear H2+H dynamics

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Abstract
The dependence of final vibrational energy, final phase, and trajectory time on the initial phase of the H2 reagent is examined on a novel potential energy surface for the collinear H3 system. For the first time, the fine structure in the borders of the reactivity bands is reported in some detail. A complex, exponentially crowding structure is found in contrast to the common impression of ’’chaotic’’ behavior in these regions. The close relation of this structure to the concepts of periodic and exponentiating trajectories is discussed. A suggestion for the implications to Feshbach resonances in semiclassical theory is made.