Abstract
During the last three years the research of fast heavy ion induced desorption was focussed again on secondary ion emission from organic material. New experiments on total sputter yields have not been performed. The measurements with ordered surface structures — i.e. Langmuir-Blodgett films — gave further evidence for the formation of craters by the impacting particle. This picture is supported by molecular-dynamics calculations. Concerning energy and angular distributions of secondary ions a particular progress was achieved by means of position sensitive stop detectors installed in time-of-flight spectrometers. Corresponding results show that desorption from organic samples occurs via an expansion mechanism in the solid, but also via a gas flow out off the track crater. Comparing secondary ion yields with other radiation effects in bioorganic material, in the high energy regime electronic sputtering is obviously a track core effect.
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