  We discuss the influence of periodic orbits on the dissociation of a model
diatomic molecule driven by a strong bichromatic laser fields. Through the
stability of periodic orbits we analyze the dissociation probability when
parameters like the two amplitudes and the phase lag between the laser fields,
are varied. We find that qualitative features of dissociation can be reproduced
by considering a small set of short periodic orbits. The good agreement with
direct simulations demonstrates the importance of bifurcations of short
periodic orbits in the dissociation dynamics of diatomic molecules.
