Abstract Using TRIUMF's off-line laser ion source test stand with a system of tunable titanium sapphire lasers, the polarization dependence of laser resonance ionization has been investigated using beryllium. A significant polarization dependence was observed for the excitation path 1S0 → 1P1∘ → 1S0, which are typical transitions for alkaline-earth and alkaline-earth like elements. This polarization dependence was further verified on Be radioactive isotopes at TRIUMF's isotope separator and accelerator facility (ISAC). Laser polarization was proven to be an important parameter in operating resonance ionization laser ion sources (RILIS). The polarization spectroscopy was performed off-line both on the 2p2 1S0 autoionizing (AI) state and high-n Rydberg states of the 2sns 1S0 and 2snd 1D2 series. The energy of the 2p2 1S0 AI state and ionization potential (IP) of beryllium were extracted as 76,167(6) cm−1 and 75,192.59(3) cm−1. Polarization spectroscopy can be used to determine the J values of newly found states in in-source spectroscopy of the complex/radioactive alkaline-earth like elements such as Ra, Sm, Yb, Pu and No.

中文翻译：

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铍的偏振相关激光共振电离

摘要 使用TRIUMF 的离线激光离子源测试台和可调谐钛蓝宝石激光器系统，研究了铍激光共振电离的偏振依赖性。对于激发路径 1S0 → 1P1∘ → 1S0，观察到显着的极化依赖性，这是碱土和类碱土元素的典型跃迁。这种极化依赖性在 TRUMF 的同位素分离器和加速器设施 (ISAC) 的 Be 放射性同位素上得到了进一步验证。激光偏振已被证明是操作共振电离激光离子源 (RILIS) 的一个重要参数。偏振光谱是在 2sns 1S0 和 2snd 1D2 系列的 2p2 1S0 自电离 (AI) 态和高 n 里德堡态上离线进行的。铍的 2p2 1S0 AI 状态和电离势 (IP) 的能量被提取为 76,167(6) cm-1 和 75,192.59(3) cm-1。偏振光谱可用于确定复合/放射性碱土类元素（如 Ra、Sm、Yb、Pu 和 No）的源内光谱中新发现状态的 J 值。