Arc plasma from Ti-C, Ti-Al, and Ti-Si cathodes was characterized with respect to charge-
state-resolved ion energy. The evaluated peak velocities of different ion species in plasma
generated from a compound cathode were found to be equal and independent on ion mass.
Therefore, measured difference in kinetic energies can be inferred from the difference in ion
mass, with no dependence on ion charge state. The latter is consistent with previous work.
These findings can be explained by plasma quasineutrality, ion acceleration by pressure …