论文标题
基于电子桥激发的激发throm-229核激发的方案
A scheme for excitation of thorium-229 nuclei based on the electronic bridge excitaion
论文作者
论文摘要
Thorium-229具有最低的核第一激发态，能量约为8 eV。核首先激发状态的极度狭窄线宽，不确定性为53 THZ，可阻止直接激发激发和核钟的实现。我们提出了一项建议，使用$^{229} $ th $^{3+} $ ions形成的线性链的库仑晶体，$^{229} $ th $ th $^{3+} $ ions in Ion陷阱的核被电子桥梁（EB）流程激动。为EB激发选择了7 $ p_ {1/2} $ throum-229核基态状态。使用在实验条件下的两级光学Bloch方程，我们计算出库仑晶体中的36个制备throum离子中的2个可以激发到核第一激发态，并且在0.22 eV的不确定性上扫描大约需要2个小时。利用EB的过渡增强和库仑晶体的长稳定性的优势，第一个激发态的能量不确定性可以限于1 GHz的阶。
Thorium-229 possesses the lowest nuclear first excited state with an energy of about 8 eV. The extremely narrow linewidth of the nuclear first excited state with the uncertainty of 53 THz prevents the direct laser excitation and the realization of the nuclear clock. We present a proposal using the Coulomb crystal of a linear chain formed by the $^{229}$Th$^{3+}$ ions, the nuclei of $^{229}$Th$^{3+}$ ions in the ion trap are excited by the electronic bridge (EB) process. The 7$P_{1/2}$ state of the thorium-229 nuclear ground state is chosen for the EB excitation. Using the two-level optical Bloch equation under experimental conditions, we calculate that 2 out of 36 prepared thorium ions in the Coulomb crystal can be excited to the nuclear first excited state, and it takes about 2 hours to scan over the uncertainty of 0.22 eV. Taking the advantage of transition enhancement of the EB and the long stability of the Coulomb crystal, the energy uncertainty of the first excited state can be limited to the order of 1 GHz.
