Surface charging of thick porous water ice layers relevant for ion sputtering experiments

被引：12

作者：

Galli, A. ^{[1
]}

Vorburger, A. ^{[1
]}

Pommerol, A. ^{[1
]}

Wurz, P. ^{[1
]}

Jost, B. ^{[1
]}

Poch, O. ^{[1
]}

Brouet, Y. ^{[1
]}

Tulej, M. ^{[1
]}

Thomas, N. ^{[1
]}

机构：

[1] Univ Bern, Inst Phys, Bern, Switzerland

来源：

PLANETARY AND SPACE SCIENCE | 2016年 / 126卷

基金：

瑞士国家科学基金会;

关键词：

Ices; Jupiter satellites; Experimental techniques; Surface charging; Sputtering; GALILEAN SATELLITES; OXYGEN ATMOSPHERE; IONOSPHERE; SPECTRA; EUROPA; PLASMA; MODEL;

D O I：

10.1016/j.pss.2016.03.016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use a laboratory facility to study the sputtering properties of centimeter-thick porous water ice subjected to the bombardment of ions and electrons to better understand the formation of exospheres of the icy moons of Jupiter. Our ice samples are as similar as possible to the expected moon surfaces but surface charging of the samples during ion irradiation may distort the experimental results. We therefore monitor the time scales for charging and discharging of the samples when subjected to a beam of ions. These experiments allow us to derive an electric conductivity of deep porous ice layers. The results imply that electron irradiation and sputtering play a non-negligible role for certain plasma conditions at the icy moons of Jupiter. The observed ion sputtering yields from our ice-samples are similar to previous experiments where compact ice films were sputtered off a micro-balance. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：63 / 71

页数：9

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