Charge distribution of multiply charged ions scattered from tungsten

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Abstract
The authors have measured the charge state distribution of 20 keV multiply charged Ne, Ar and Kr ions scattered from a polycrystalline tungsten target. For primary charge states up to 8+ only singly and doubly charged reflected particles are observed. However, when the primary charge state exceeds 8+, scattering into triply charged ions does occur and the shapes of the respective energy spectra also change. An explanation is given in terms of autoionisation processes occurring when the scattered particle leaves the surface in a highly excited state.