Ultra-long-range states in excited 3He2

Long-range potentials have been calculated for ³He₂ molecules dissociating to ³He 2 ³S + ³He 2 ³P, including the retarded dipole and the van der Waals interactions. Ultra-long-range wells with depths of up to about 2.4 GHz have been found in many of the adiabatic body-fixed potentials and rovibrational levels have been calculated for some of these wells, which have been found to support up to 4 rotationless vibrational levels.