  Recently it has been recognized that electronic conical intersections in
molecular systems can be induced by laser light even in diatomics. As is known
a direct consequence of these accidental degeneracies is the appearence of
nonadiabatic effects which has a strong impact on the nuclear quantum dynamics.
Studying the photodissociation process of the $\mathrm{D}_{2}^{+}$ molecule, we
report here some novel and observable quantum interference phenomena that arise
from the topological singularity induced by a strong laser field.
