论文标题
高电荷Th-229离子中的电子桥梁激发
Electronic bridge excitation in highly charged Th-229 ions
论文作者
论文摘要
理论上研究了高度充电离子中的电子桥机构的8 eV $^{2.29m} $ th异构体的激发。通过利用开放$ 4F $轨道的丰富水平方案以及高电荷离子对光电离的鲁棒性，可以使用脉冲高强度光激光器来通过将其耦合到电子壳来有效地驱动核过渡。我们展示了如何从亚稳态电子状态开始的电子束离子陷阱中实现有希望的电子桥梁。该设置将避免需要可调真空紫外线激光。基于我们的理论预测，可以使用逼真的激光参数确定$ 10^{ - 5} $ eV的不确定性的异构体能量。
The excitation of the 8 eV $^{229m}$Th isomer through the electronic bridge mechanism in highly charged ions is investigated theoretically. By exploiting the rich level scheme of open $4f$ orbitals and the robustness of highly charged ions against photoionization, a pulsed high-intensity optical laser can be used to efficiently drive the nuclear transition by coupling it to the electronic shell. We show how to implement a promising electronic bridge scheme in an electron beam ion trap starting from a metastable electronic state. This setup would avoid the need for a tunable vacuum ultraviolet laser. Based on our theoretical predictions, determining the isomer energy with an uncertainty of $10^{-5}$ eV could be achieved in one day of measurement time using realistic laser parameters.
