We report a method of creating pure ⁹Be⁺ ions by a 2 + 1 resonance-enhanced multiphoton ionization for the ionization potential of 75 192.64(6) cm⁻¹ (133 nm). The efficient generation of ⁹Be⁺ ions has been realized in a segmented linear ion trap. The average loading rates with a 10 ns, 1 mJ laser at 310 nm and 306 nm are 3.8 and 1.3 ions per pulse, respectively. This method has the advantage of reducing the electron contamination to the ion trap electrodes greatly. It also reduces the requirement of single-photon energy while satisfying the need for ionization probability and can be applied to other atoms with high ionization thresholds.

中文翻译：

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使用 2 + 1 共振增强多光子电离过程产生 9Be+ 离子的有效方法

我们报告了一种通过 2 + 1 共振增强多光子电离产生纯⁹ Be ⁺离子的方法，电离势为 75 192.64(6) cm ^-1 (133 nm)。⁹ Be ⁺离子的高效生成已在分段线性离子阱中实现。10 ns、1 mJ 激光在 310 nm 和 306 nm 的平均加载速率分别为每个脉冲 3.8 和 1.3 个离子。这种方法的优点是大大减少了电子对离子阱电极的污染。它还在满足电离概率需要的同时降低了对单光子能量的要求，可以应用于其他具有高电离阈值的原子。