Abstract
Our experimental set-up allows us to keep a single dust grain trapped in a high-vacuum chamber for hours or days and to affect it by electron or ion beams. It apparently makes possible to study each particular charging process separately but, as our results have shown, the influence of emissions from the surfaces surrounding the experimental space cannot be neglected in interpretation of results.The paper is devoted to experimental and theoretical investigations of ion field emission from spherical non-conducting monodisperse melamine resin grains with diameters of 2.35(m∼1×10-14kg), 4.97, and 9.78μm that were exposed by the ion beam with energies ranging from 0.3 to 5keV. We present the methodology of the determination of different charging currents as well as the determination of a grain size. These quantities are then used for estimation of equilibrium potentials. Results obtained using He ions show that ion field emission from the investigated grains can be recorded at field intensities of the order of 109V/m and strongly depends on a history of the grain charging.
Published Version
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