# 彭宁离子阱

## 历史

"I began to focus on the magnetron/Penning discharge geometry, which, in the Penning ion gauge, had caught my interest already at G?ttingen and at Duke. In their 1955 cyclotron resonance work on photoelectrons in vacuum Franken and Liebes had reported undesirable frequency shifts caused by accidental electron trapping. Their analysis made me realize that in a pure electric quadrupole field the shift would not depend on the location of the electron in the trap. This is an important advantage over many other traps that I decided to exploit. A magnetron trap of this type had been briefly discussed in J.R. Pierce's 1949 book, and I developed a simple description of the axial, magnetron, and cyclotron motions of an electron in it. With the help of the expert glassblower of the Department, Jake Jonson, I built my first high vacuum magnetron trap in 1959 and was soon able to trap electrons for about 10 sec and to detect axial, magnetron and cyclotron resonances. " – H. Dehmelt

（我开始专注于彭宁电离压力计中的磁控管/彭宁放电的几何结构，其实我在哥廷根还有杜克大学的时候就已经感兴趣了，他们1955年在vacuum Franken”和“Liebes”上进行有关光电子的回旋共振的工作显示了由于意外的电子俘获导致的没有遇见的频率偏移。他们的分析使我认识到，在纯的四极电场中，偏移将不依赖于在电子在离子阱中的位置。这种优势很明显区别于其他离子阱，所以我决定利用它。 1940年，J.R. Pierce在他的书里讨论过这种类型的磁控管阱，我对其中电子的轴向运动，磁控运动和回旋运动做了一个简单描述。通过系里一个玻璃制作专家，Jake Jonson，我在1959年制作了第一个真空磁控阱，这个装置可以将电子捕获10秒左右的时间，并且可以测量电子的轴，磁控管还有回旋共振。）

## 参考文献

1. ^ Hans G. Dehmelt - Biographical. Nobel Prize. 1989 [June 1, 2014].
2. ^ Brown, L.S.; Gabrielse, G. Geonium theory: Physics of a single electron or ion in a Penning trap (PDF). Reviews of Modern Physics. 1986, 58: 233. Bibcode:1986RvMP...58..233B. doi:10.1103/RevModPhys.58.233.