[en] An experiment is presented that is related to molecular physics regarding the photodissociation of Ca₂ molecules. The authors study a very simple quantum mechanical system: two atoms sharing a single photon. The photodissociation of a diatomic homonuclear molecule A₂ is considered, yielding two atoms recoiling in opposite directions--one in an excited state and one in the ground state. This situation suggests the possibility of a quantum interference between these two paths. The interference effect is described. The basic experimental set-up is described in which a mode locked Krypton laser is employed which yielded pulses with a width 120 ps at a rate of 82.3 MHz, the average power being 60 mW. Results are presented