Reference Label	Details
Sansonetti 2005	J. E. Sansonetti and W. C. Martin, J. Phys. Chem. Ref. Data 34, 1559-2259 (2005) Handbook of Basic Atomic Spectroscopic Data Web: http://physics.nist.gov/PhysRefData/Handbook/
Kristensen 1997a	P. Kristensen, U. V. Pedersen, V. V. Petrunin, T. Andersen, and K. T. Chung, Phys. Rev. A 55, 978-983 (1997) Binding Energy of the Metastable He- Ion