44 citations · 140 across the 9 of their papers we have counts for
9 papers
Laser Cooling and Hyperfine Measurements of Radium-225 Ions
Roy Ready, Haoran Li, Spencer Kofford +10
Ra ions (nuclear spin ) have transitions that are first-order insensitive to magnetic field noise, which is advantageous for optical clocks and quantum informati…
Laser cooling and trapping of Ra
M. Fan, Roy A. Ready, H. Li +7
We report laser cooling and trapping of Ra ions. This was realized via two-step photoionization loading of radium into an ion trap. A robust source for Ra atoms…
Ion optical clocks with three electronic states
C. A. Holliman, M. Fan, A. M. Jayich
Optical clocks are the apotheosis of precision measurement, but they require frequent maintenance by scientists. The supporting laser systems are a particularly demanding component…
Radium Ion Optical Clock
C. A. Holliman, M. Fan, A. Contractor +2
We report the first operation of a Ra optical clock, a promising high-performance clock candidate. The clock uses a single trapped Ra ion and operates on the $7…
Direct measurement of the transition frequency in Ra
C. A. Holliman, M. Fan, A. Contractor +2
We report a direct measurement of the electric dipole transition frequency in Ra. With a single laser-cooled radium ion we…
Optical Mass Spectrometry of Cold and
M. Fan, C. A. Holliman, X. Shi +5
We present an all-optical mass spectrometry technique to identify trapped ions. The new method uses laser-cooled ions to determine the mass of a cotrapped dark ion with a sub-dalto…
Measurements of electric quadrupole transition frequencies in Ra
C. A. Holliman, M. Fan, A. M. Jayich
We report the first driving of the and electric quadrupole (E2) transitions in Ra. We measur…
Measurement of the state branching fractions in
M. Fan, C. A. Holliman, S. G. Porsev +2
We report a measurement of the radium ion's state branching fractions and improved theoretical calculations. With a single laser-cooled i…
Laser Cooling of Radium Ions
M. Fan, C. A. Holliman, A. L. Wang +1
The unstable radium nucleus is appealing for probing new physics due to its high mass, octupole deformation and energy level structure. Ion traps, with long hold times and low part…