Kinematically complete studies of collisions between simple molecular ions and neutral gas targets*

Collision-induced dissociation, dissociative capture, and target ionization (with or without projectile fragmentation) from few keV molecular ions impinging on various gas targets have been studied using a coincidence 3D momentum imaging technique. The newly installed apparatus employs a cold target jet configuration within a longitudinal spectrometer allowing for imaging of the molecular fragments, including neutrals and molecular ions that survive hard collisions, as well as the recoil ion on a single detector. Such detection capabilities enable kinematically complete studies for the dissociative capture channel and near-kinematically complete studies of all other channels. The results of, for example, 3 keV H$_{2}^{+}$+Ar collisions will be presented.