Individual and center-of-mass resonances in the motional spectrum of an electron cloud in a Penning trap
Individual and center-of-mass resonances in the motional spectrum of an electron cloud in a Penning trap
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潘宁陷阱中电子云运动谱中的个体共振和质心共振
DOI：
10.1140/epjd/e20020033
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
G. Werth
中科院分区：
文献类型：
--
作者：
P. Paasche;T. Valenzuela;D. Biswas;C. Angelescu;G. Werth
我们通过实验检查了潘宁陷阱中电子云的运动光谱。当轴向振荡由射频场激发时，共振呈现出双重结构。两种成分都不同地取决于捕获的电子数量，并且具有不同的形状和宽度。我们得出的结论是，其中一个对应于单个电子的激发，而另一个对应于云的质心模式。质心共振的阈值行为表明它是马蒂厄型运动方程的参数不稳定。
We have examined experimentally the motional spectrum of an electron cloud confined in a Penning trap. When the axial oscillation is excited by a radio frequency field the resonance exhibits a double structure. Both components depend differently on the number of trapped electrons and have different shape and width. We conclude that one of them corresponds to the excitation of the individual electrons while the other is the center-of-mass mode of the cloud. The threshold behaviour of the center-of-mass resonance suggests that it is a parametric instability of a Mathieu type equation of motion.