1. Laser Cooling of Radium-225 Ions
- Author
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Ready, Roy, Li, Haoran, Kofford, Spencer, Kwapisz, Robert, Dan, Huaxu, Sawhney, Akshay, Fan, Mingyu, Holliman, Craig, Shi, Xiaoyang, Sever-Walter, Luka, Gaiser, A. N., Griswold, J. R., and Jayich, A. M.
- Subjects
Physics - Atomic Physics - Abstract
Radium-225 (nuclear spin $I=1/2$) ions possess electronic hyperfine transitions that are first-order insensitive to magnetic field noise, which is advantageous for optical clocks and quantum information science. We report on laser cooling and trapping of radium-225 ions and hyperfine splitting measurements of the ion's $7s$ $^2S_{1/2}$, $7p$ $^2P_{1/2}$, and $6d$ $^2D_{3/2}$ states. We measured the ground state hyperfine constant, $A(^2S_{1/2}) = -27.684511056(9)\ \mathrm{GHz}$, and the quadratic Zeeman coefficient, $C_2 = 142.3(10)\ \mathrm{Hz\ G}^{-2}$, of the $^2S_{1/2} (F=0, m_F = 0) \leftrightarrow~^2S_{1/2} (F=1, m_{F} = 0)$ transition. We also measured the hyperfine constants of the $^2P_{1/2}$ state, $A(^2P_{1/2}) = -5.447(4)\ \mathrm{GHz}$, and the $^2D_{3/2}$ state, $A(^2D_{3/2}) = -619.7(11)\ \mathrm{MHz}$., Comment: 5 pages, 4 figures
- Published
- 2024