Quantum electrodynamic calculation of the hyperfine structure of 3He
  The combined fine and hyperfine structure of the $2^3P$ states in $^3$He is calculated within the framework of nonrelativistic quantum electrodynamics. The calculation accounts for the effects of order $m\alpha^6$ and increases the accuracy of theoretical predictions by an order of magnitude. The results obtained are in good agreement with recent spectroscopic measurements in $^3$He. 
K. Pachucki, V. A. Yerokhin, P. Cancio Pastor
physics.atom-ph