A5039329729- Atomic and Molecular Physics
- Advanced Frequency and Time Standards
- Nuclear physics research studies
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Radioactive Decay and Measurement Techniques
- Nuclear materials and radiation effects
- Luminescence Properties of Advanced Materials
- Inorganic Chemistry and Materials
- Quantum Chromodynamics and Particle Interactions
- Scientific Measurement and Uncertainty Evaluation
- Laser-induced spectroscopy and plasma
- X-ray Diffraction in Crystallography
University of California, Santa Barbara
2023-2025
Montana State University
2022
Michigan State University
1989
We report lifetime measurements of the metastable $6d\, ^2\!D_{5/2}$ and ^2\!D_{3/2}$ states radium ion. The measured lifetimes, $\tau_{5} = $ 303.8(1.5) ms $\tau_{3} 642(9) ms, are important for optical frequency standards benchmarking high-precision relativistic atomic theory. Independent reported measurements, $D$ state lifetimes were calculated using coupled-cluster single double triple method, in which equations both core valence excitations solved iteratively. method was designed...
We report laser cooling and trapping of ${}^{224}{\mathrm{Ra}}^{+}$ ions. This was realized via two-step photoionization loading radium into an ion trap. A robust source for $^{224}\mathrm{Ra}$ atoms, which have a 3.6-day half-life, with effusive oven containing $^{228}\mathrm{Th}$, has 1.9-yr continuously generates its $\ensuremath{\alpha}$-decay. characterized the efficacy this found that after depleting built-up thorium decay provides continuous atoms suitable trapping. The vacuum system...
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 trapping of radium-225 splitting measurements the ion's $7s$ $^2S_{1/2}$, $7p$ $^2P_{1/2}$, $6d$ $^2D_{3/2}$ states. measured ground state constant, $A(^2S_{1/2}) = -27.684511056(9)\ \mathrm{GHz}$, quadratic Zeeman coefficient, $C_2 142.3(10)\ \mathrm{Hz\...
We report on spectroscopy of the low-lying electronic transitions in $^{224}$Ra$^+$. The ion's low charge to mass ratio and convenient wavelengths make $^{224}$Ra$^+$ a promising optical clock candidate. measured frequencies $^2{S}_{1/2} \ $$\leftrightarrow$$\ ^2{P}_{1/2}$ cooling transition, $^2{S}_{1/2}\ ^2{D}_{5/2}$ $^2{D}_{3/2} ^2{P}_{3/2}$ electric dipole $^2{D}_{5/2} cleanout transition. From these measurements we calculate $^2{D}_{3/2}\ repump ^2{D}_{3/2}$ quadrupole
We report laser cooling and trapping of $^{224}$Ra$^+$ ions. This was realized via two-step photoionization loading radium into an ion trap. A robust source for $^{224}$Ra atoms, which have a 3.6-day half-life, with effusive oven containing $^{228}$Th, has 1.9-yr continuously generates its $\alpha$-decay. characterized the efficacy this found that after depleting built-up thorium decay provides continuous atoms suitable trapping. The vacuum system been sealed more than 6 months continues to...