Sputtering of Water Ice At 30–140 K BY 0.5–6.0 keV H+ and Ne+ Ions
Sputtering of Water Ice At 30–140 K BY 0.5–6.0 keV H+ and Ne+ Ions
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30–140 K 0.5–6.0 keV H+ 和 Ne+ 离子溅射水冰
DOI：
10.1007/978-94-009-5418-2_19
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发表时间：
1985
影响因子：
3.7
通讯作者：
Y. Mekler
中科院分区：
文献类型：
--
作者：
A. Bar;G. Herman;M. Rappaport;Y. Mekler
实验研究了0.5-6 KeV的H ~+离子在30- 140 K温度下对水冰的溅射。水分子的溅射被发现是在整个温度范围内的温度无关。氖离子存款他们的能量在冰的核碰撞，而质子的能量沉积机制逐渐从主要的核碰撞转移到主要的电子过程从0.5至6千电子伏。现有的核溅射理论很好地预测了喷射水分子的产额，在电子过程区的实验结果与Lanzerotti，Brown和约翰逊的实验结果一致。然而，被离子轰击的水的主要质量损失是通过O2和H2分子以及H原子的喷射，其超过水分子的喷射。在超过~ 100 K的温度下，O2和H2的产生显着增加，而H2O和H的产生与温度无关，这表明O2和H2是在冰的大部分中产生的，而H2O和H原子是从表面或近表面层喷出的。大约2%的质量损失是由于正离子和团簇的喷射。
The sputtering from water ice at 30–140K by H+ ions of 0.5–6 KeV was studied experimentally. The sputtering of water molecules was found to be temperature independent over the whole temperature range. Neon ions deposit their energy in the ice by nuclear collisions, while for protons the energy deposition mechanism shifts gradually from predominantly nuclear collisions to predominantly electronic processes from 0.5 to 6 KeV. The existing theory of nuclear sputtering predicts very well the yield of ejected water molecules and the experimental results in the region of electronic processes agree well with the experimental results of Lanzerotti, Brown and Johnson. However, the major mass loss of water bombarded by ions is via the ejection of O2 and H2 molecules and of H atoms, which exceed the ejection of water molecules. O2 and H2 production is markedly enhanced at temperatures exceeding ~100K whereas H2O and H production are temperature independent, suggesting that O2 and H2 are produced in the bulk of the ice whereas H2O and H atoms are ejected from the surface or near surface layers. About 2% of the mass loss is due to the ejection of positive ions and clusters.