Higher-order recoil corrections for triplet states of the helium atom
Abstract
Nuclear recoil corrections of order α6\,m2/M are calculated for the lowest-lying triplet states of the helium atom. It improves the theoretical prediction for the isotope shift of the 23S-23P transition energy and influences the determination of the 3He-4He nuclear charge radii difference. This calculation is a step forward on the way towards the direct determination of the charge radius of the helium nucleus from spectroscopic measurements.
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