Reference Label	Details
note unc	The quoted uncertainty appeared to correspond to one std dev. and was multiplied by 2 to come closer to the desired 95% confidence limit
Semeria 2016	L. Semeria, P. Jansen, and F. Merkt, J. Chem. Phys. 145, 204301/1-10 (2016) Precision Measurement of the Rotational Energy-Level Structure of the Three-Electron Molecule He2+