从商用RF离子源引出的亚稳态氖束的特性
Characterization of a metastable neon beam extracted from a commercial RF ion source
摘要：
我们已经使用商业RF离子源提取亚稳态氖原子束。该源很容易被纳入我们现有的系统，并在安装后一天内运行。亚稳态的速度分布，通量，流量，和效率进行了研究，为不同的RF功率和压力，并发现在一个最佳的流量密度为$2\times10^{12}\,$ atoms/s/sr。为了获得准确的测量离开源的亚稳态原子的量，我们插入一个法拉第杯的光束线和淬火其中一些使用弱$633\,$ nm激光束。为了确定在到达我们的探测器之前有多少光束被淬灭，我们设计了一个简单的淬灭跃迁模型，并研究了不同激光功率下的淬灭跃迁。这种探测方法可以很容易地适用于其他惰性气体原子。
英文摘要：
We have used a commercial RF ion-source to extract a beam of metastable neon atoms. The source was easily incorporated into our existing system and was operative within a day of installation. The metastable velocity distribution, flux, flow, and efficiency were investigated for different RF powers and pressures, and an optimum was found at a flux density of $2\times10^{12}\,$atoms/s/sr. To obtain an accurate measurement of the amount of metastable atoms leaving the source, we insert a Faraday cup in the beam line and quench some of them using a weak $633\,$nm laser beam. In order to determine how much of the beam was quenched before reaching our detector, we devised a simple model for the quenching transition and investigated it for different laser powers. This detection method can be easily adapted to other noble gas atoms.
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