Jun 13 – 19, 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Precision Measurement of Lithium Hyperfine and Fine Structure Intervals

Jun 15, 2015, 4:45 PM
CCIS L2-200 (University of Alberta)

CCIS L2-200

University of Alberta

Oral (Non-Student) / orale (non-étudiant) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) M2-10 Atomic and Molecular Spectroscopy: microwave to X-ray (DAMOPC) / Spectroscopie atomique et moléculaire: des micro-ondes aux rayons X (DPAMPC)


Prof. William van Wijngaarden (Physics Department, York University)


A number of experiments have precisely measured fine and hyperfine structure splittings as well as isotope shifts for several transitions at optical frequencies for 6,7Li [1]. These data offer an important test of theoretical techniques developed by two groups to accurately calculate effects due to QED and the finite nuclear size in 2 and 3 electron atoms. The work by multiple groups studying several transitions in both Li+ and neutral Li permits a critical examination of the consistency of separately the experimental work as well as theory. Combining the measured isotope shifts with the calculated energy shifts passing these consistency tests permits the determination of the relative nuclear charge radius with an uncertainty approaching 1 x 10-18 meter which is more than an order of magnitude better than obtained by electron scattering. Progress toward a precision measurement of the fine structure constant is also discussed. 1. W. A. van Wijngaarden & B. Jian, European Physical Journal D, 222, 2057-2066 (2013)

Primary authors

Mr Hang Yang (Physics Department, York University) Prof. William van Wijngaarden (Physics Department, York University)

Presentation materials