Constants Topics: Values Energy Equivalents Searchable Bibliography Background Constants Bibliography Constants, Units & Uncertainty home page	Articles on 2018 Adjustment Detailed description of the 2018 adjustment, including the covariance matrix of selected constants: E. Tiesinga, P. J. Mohr, D. B. Newell, and B. N. Taylor, J. Phys. Chem. Ref. Data 50, 033105 (2021) E. Tiesinga, P. J. Mohr, D. B. Newell, and B. N. Taylor, Rev. Mod. Phys. 93, 025010 (2021)    Return to Latest (2022) values of the constants.