Electron-Nuclear Energy Sharing in Above-Threshold Multiphoton Dissociative Ionization of H2

We report experimental observation of the energy sharing between electron and nuclei in above-threshold multiphoton dissociative ionization of H-2 by strong laser fields. The absorbed photon energy is shared between the ejected electron and nuclei in a correlated fashion, resulting in multiple diagonal lines in their joint energy spectrum governed by the energy conservation of all fragment particles.