2019 CAP Congress / Congrès de l'ACP 2019

56 - Ultrahigh-Precision Measurement of the n = 2 Triplet P Fine Structure of Atomic Helium Using Frequency-Offset Separated Oscillatory Fields

4 Jun 2019, 17:27

2m

SWH 9082 + AQ South-East Corner / coin sud-est (Simon Fraser University)

Poster Competition (Graduate Student) / Compétition affiches (Étudiant(e) 2e ou 3e cycle) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) DAMOPC Poster Session & Student Poster Competition Finals (26) | Session d'affiches DPAMPC et finales du concours d'affiches étudiantes (26)

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.