Abstract
Alpha particle bombardment of a Si surface-barrier detector in vacuum causes the release of several species of ions from the contaminant layer on the detector surface. The mass-to-charge ratios of the ions are determined by time-of-flight spectroscopy. A significant fraction of the ions are H+ with a yield of 4×10−5 H+ per alpha particle and an emission energy of less than 70 eV. This ion source could be useful for testing slow μ+ collection optics and possibly for studying the diffusion of H atoms in liquid He.
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