Speaker
K. Kato
(York University)
Description
For decades, improved theory and experiment of the $n$=2 $^3$P fine structure of helium have allowed for increasingly precise tests of quantum electrodynamics, determinations of the fine-structure constant $\alpha$, and limitations on possible beyond-the-standard-model physics. Here we use the new frequency-offset separated-oscillatory-fields technique to measure the 2$^3$P$_2$$\to$2$^3$P$_1$ interval. Our result of 2 291176590(25) Hz represents a major step forward in precision for helium fine-structure measurements.
Primary authors
K. Kato
(York University)
T. D. G. Skinner
(York University)
E. A. Hessels
(York University)
