Fully Differential Study of Dissociative Capture and Coulomb explosion in p $+$ H$_{\mathrm{2}}$ Collisions

We measured fully differential cross sections (FDCS) for dissociation due to capture and excitation to a repulsive state as well as Coulomb explosion due to double electron capture in p$+$H$_{\mathrm{2}}$ collisions. FDCS were analyzed for various molecular orientations relative to the momentum transfer in the transverse direction (q$_{\mathrm{x}})$ as a function of projectile scattering angle ($\theta_{\mathrm{p}})$. Two orientations parallel and perpendicular to q$_{\mathrm{x}}$ were analyzed. For the latter orientation two-center interference was identified. For the dissociative case, data were obtained for a range of kinetic energy releases (KER) from 5eV to 11eV. In this region the 2p$\pi_{\mathrm{u\thinspace }}$and the 2s$\sigma_{\mathrm{g\thinspace }}$states mainly contribute to dissociation. The interference pattern observed is consistent with the 2s$\sigma_{\mathrm{g\thinspace }}$state being dominant at large $\theta _{\mathrm{p\thinspace }}$while at small $\theta_{\mathrm{p\thinspace }}$both states contributes significantly. In double capture case, KER between 13eV to 27eV were selected since here only one channel (Coulomb explosion) contributes and the KER determines the inter-nuclear separation, the phase angle should be well determined. Nevertheless, the observed interference pattern is significantly less pronounced than for dissociation.