Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1681908 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2012 | 4 Pages |
Abstract
The interaction of 16 keV Cuâ ions with Al2O3 nano-capillaries of 50 nm diameter and 10 μm length was studied. The angular and charge state distributions of the transmitted particles were measured by a position-sensitive microchannel plate detector. It shows that transmitted particles appear as two peaks and consist of three charge states, Cuâ, Cu0 and Cu+. As the tilt angle increases, more Cuâ ions lose electrons resulting in the formation of Cu0 and Cu+ during multiple collisions with the capillary walls. Unlike previously reported results on highly charged ions, keV-energy Cuâ ions undergo significant charge exchange processes with the inner walls of the capillaries. This indicates that the guiding effect is absent in the negative ion transmission under the very low ion current conditions.
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Authors
Hongwei Wang, Lin Chen, Xueyang Lv, Chunlin Zhou, Juanjuan Jia, Peng Zhou, Jianxiong Shao, Mingchao Ji, Ximeng Chen,