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10 papers · 2 filters
Accurate prediction of clock transitions in a highly charged ion with complex electronic structure
C. Cheung, M. S. Safronova, S. G. Porsev +3
We have developed a broadly-applicable approach that drastically increases the ability to accurately predict properties of complex atoms. We applied it to the case of Ir, w…
State-dependent optical lattices for the strontium optical qubit
A. Heinz, A. J. Park, N. Šantić +5
We demonstrate state-dependent optical lattices for the Sr optical qubit at the tune-out wavelength for its ground state. We tightly trap excited state atoms while suppressing the…
Fast apparent oscillations of fundamental constants
Dionysios Antypas, Dmitry Budker, Victor V. Flambaum +3
Precision spectroscopy of atoms and molecules allows one to search for and to put stringent limits on the variation of fundamental constants. These experiments are typically interp…
High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem
Steffen Kühn, Chintan Shah, José R. Crespo López-Urrutia +29
For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic transitions, and , in Fe XVII ions found oscillator…
High-precision measurement and ab initio calculation of the electric quadrupole transition amplitude in Pb
Daniel L. Maser, Eli Hoenig, B. -Y. Wang +4
We have completed a measurement of the 939 nm electric quadrupole () transition amplitude in atomic lead. Using a Faraday rotation…
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…