Production of “Fast” and “Exotic” Negative Ions in He II
Production of “Fast” and “Exotic” Negative Ions in He II
复制标题
He II 中“快速”和“奇异”负离子的产生
DOI：
10.7567/jjaps.26s3.105
复制
发表时间：
1987
影响因子：
1.5
通讯作者：
P. McClintock
中科院分区：
文献类型：
--
作者：
Charles D. H. Williams;P. C. Hendry;P. McClintock
“快”负离子提供了，原则上，根据其SVP的决定的朗道临界速度在HeII中的roton创建的基础，但精确的测量将需要一个更可靠的离子源比迄今为止报道的。众所周知，液体表面上方的辉光放电对于产生大通量的“快”或“外来”离子是必要的，但不是充分的。几种新的电极几何形状已被测试与HeII在1.03K与变量的结果进行了讨论。我们报告的新观察，放电必须是白色（而不是更常见的紫色）的“快速”或“外来”离子产生。
The “fast” negative ion provides, in principle, the basis for a determination of the Landau critical velocity for roton creation in HeII under its SVP; but precise measurements will require a more reliable ion source than those reported hitherto. It is known that a glow discharge above the liquid surface is necessary, but not sufficient, for the production of large fluxes of “fast” or “exotic” ions. Several new electrode geometries have been tested with HeII at 1.03K with variable results which are discussed. We report the new observation that the discharge must be white (rather than the more usual violet) for “fast” or “exotic” ions to be generated.