Charge-State Dependence of the Coulomb Explosion of 10-MeV OH+

A molecular O${\mathrm{H}}^{+}$ beam has been produced in a Pelletron accelerator. The Coulomb explosion of 10-MeV O${\mathrm{H}}^{+}$ in thin carbon foils was studied by measuring energy and angular distributions of protons in simultaneous coincidence with the emerging oxygen charge states. A simple model of effective charge illustrates the use of such coincidence measurements to provide information about the electronic screening of moving ions in a solid, and about the formation of emergent charge states.