Modeling the secondary emission yield of salty ice dust grains

Abstract

Please cite this article as: Richterová, I., Němeček, Z., Pavlu, J., Beránek, M., Šafránková, J., Modeling the secondary emission yield of salty ice dust grains, Icarus (2010Icarus ( ), doi: 10.1016Icarus ( /j.icarus.2010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Modeling the secondary emission yield of salty ice dust grains AbstractSecondary emission is one of important processes leading to dust grain charging in many plasma environments. The secondary yield varies with the grain material, shape, and size. Several experiments confirmed that the yield of small grains differs from that of planar samples. Among other materials, ices of different compositions can be frequently found in the interplanetary space and/or planetary magnetospheres. However, the admixtures can significantly influence the inner structure of such materials and thus may change their yield. We present numerical simulations that provide a realistic description of the secondary emission process from water ice grains. The simulations reveal that the secondary emission yield increases as the grain dimension decreases to tens of nanometers. The yield of backscattered primary electrons approaches unity and the grain can be charged to high positive potentials under these conditions. We found that any reasonable admixture of NaCl does not alter secondary electron emission properties significantly.

Secondary electron yield measurements of carbon covered multilayer optics

“…For these samples, ı max and its corresponding energy, E 0max , were also calculated. In addition, literature values for graphite are shown for comparison [13,19,31]. Our results, e.g.…”

Secondary electron emission from surfaces with small structure

“…The influence of porosity on electron-induced SEE was considered by Millet and Lafon [12]. There are also some numerical models of SEE from dust grains [24]. However all these approaches assume a smooth surface of the object.…”

Secondary Emission From Non-Spherical Dust Grains With Rough Surfaces: Application to Lunar Dust

“…When a σ T increase along the electron path is not omitted, electrons travel a shorter distance than that given by the mean-free path, λ(E). This effect is potentially important for samples containing light species and, thus, Richterová et al (2011b) suggested a model correction that was applied to ice grains. The present calculations follow this approach.…”