Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy
Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy
复制标题
双色两步光电离光谱观察铀的奇宇称自电离能级
DOI：
10.1088/1361-6455/abf89f
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Sakamoto Tetsuo
中科院分区：
文献类型：
--
作者：
Miyabe Masabumi;Satou Yukihiko;Wakaida Ikuo;Terabayashi Ryohei;Sonnenschein Volker;Tomita Hideki;Zhao Yue;Sakamoto Tetsuo
利用高重复率钛蓝宝石激光器和铀空心阴极灯进行双色两步光电离光电光谱分析，寻找铀的两步共振电离方案。通过第一步激光和扫描第二步激光波长，将基态的铀原子激发到五个偶宇称激发态，观察到许多电离跃迁。通过阻挡第一步激光，单色双光子电离跃迁也被识别出来。从这些结果中，我们发现铀在能量中的奇宇称自电离能级超过50个，范围从电离势（49958.4 cm−1）到51 150 cm−1。测定的能级与先前报道的值相差在±1 cm−1以内。
Two-color two-step photoionization optogalvanic spectroscopy was performed using high-repetition-rate titanium sapphire lasers and a uranium hollow cathode lamp to find the two-step resonance ionization schemes of uranium. Many ionization transitions were observed by exciting uranium atoms in a ground state into five, even parity, excited levels with the first-step laser and by scanning the second-step laser wavelengths. By blocking the first-step laser, single-color, two-photon ionization transitions were also identified. From these results, we have found more than 50 odd-parity autoionizing levels of uranium in the energy, ranging from the ionization potential (49958.4 cm− 1) to 51 150 cm− 1. The determined energy levels are within∼±1 cm− 1 of previously reported values.