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Sputtering efficiency of LiF surfaces on impact of low energy neutral helium (20-80 eV): Calibration of the interstellar neutral helium instrument on ULYSSES

Rosenbauer, H.; Witte, M.; Banaszkiewicz, M. +1 more

For the detection of interstellar neutral helium particles entering the inner solar system, a novel detection technique has been developed using sputtering of secondary ions from lithium-fluoride (LiF) surfaces on the impact of He particles. In order to be able to determine the interstellar He fluxes, the detection efficiency had to be determined …