Abstract
The performance of particle detectors using superconducting tunnel junctions has been studied for metal cluster or molecular ions accelerated at 3keV. The output pulse height for individual ion impact decreases as the mass of projectiles increases in a mass range of less than 800amu. In addition, pulse height reduction effects strongly depend on the molecular species. These phenomena are understood by taking into account secondary electron emission that carries part of the deposited kinetic energies of ion away from the junction surface.
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