Stark Shifts Within the(1s2s)S13State of He

Abstract
We have measured the relative Stark shift between the mJ=±1 and the mJ=0 Zeeman sublevels of the 2S13 metastable state in helium. This shift should be zero in the LS coupling limit. The shifts is (1.27 ±.04) × 106 Hz/(V/cm)2, and decreases the normal magnetic field splitting between the mJ=+1 and the mJ=0 sublevels.