Efficient emission of positronium negative ions from Cs deposited W(100) surfaces
Efficient emission of positronium negative ions from Cs deposited W(100) surfaces
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从 Cs 沉积的 W(100) 表面有效发射正电子负离子
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Michishio
中科院分区：
文献类型：
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作者：
Y. Nagashima;Toshihide Hakodate;A. Miyamoto;K. Michishio
研究了Cs沉积W(100)表面的正电子负离子发射。在W(100)表面涂覆Cs后，发射效率发生了显著的变化。在沉积后立即测量了具有2.2x1014 原子 cm-2Cs覆盖率的W(100)靶的转换效率(产生离子的入射慢正电子的比例)，在沉积后立即测量的时间间隔为3×10~3 S，这比清洁的未镀膜的W(100)表面的转换效率高出两个数量级，比迄今报道的最高效率高出45倍。
The emission of positronium negative ions from Cs deposited W(100) surfaces has been studied. A dramatic change in the emission efficiency was observed upon coating a W(100) surface with Cs. The conversion efficiency (the fraction of incident slow positrons yielding the ions) of the W(100) target with a 2.2×1014 atoms cm- 2 Cs coverage, measured over a time interval of 3×103 s immediately after deposition, was found to be 1.25%, which is two orders of magnitude higher than that obtained for the clean, uncoated W(100) surface and 45 times greater than the highest efficiency reported thus far.