Cluster-impact fusion II: Time-of-flight experiments

Time-of-flight cluster-impact fusion studies were carried out by pulsing low-velocity beams. Time-of-flight mass spectra and experiments in which the production of fusion protons was correlated with the arrival times of the cluster ions at the target show that low-molecular-weight ions containing oxygen (i.e., ${\mathrm{D}}_2$ ${\mathrm{O}}^{+}$,${\mathrm{D}}_3$ ${\mathrm{O}}^{+}$) cannot be responsible for observed fusion events.