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An optical probing method has been used successfully to measure the kinetic energy released onto fragments in dissociative charge exchange of $H2+$ tons with cesium. By monitoring the laser induced fluorescence of the Balmer beta atomic line $(n=2ton=4)$, specific molecular fragmentation to the $H(1s)+H(2I)$ or higher dissociation limits was investigated. The spectrum exhibits several peaks and a clear break at 1.9 eV. Predissociation of $n=3$ Rydberg states is invoked as the dominant contribution Also for MLarzilliere: Laboratoire de Spectrometrie lonique et Moleculatre, Associe au CNRS, Universite Lyon-I 69622 Villeurbanne Cedex FRANCE