The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Hartree energy
 $ E_{\rm h} = \alpha^2 m _{\rm e} c^2= e^2/4{\rm\pi} \epsilon_0 a_0 = 2hcR_\infty $
 Numerical value  4.359 744 722 2060 x 10-18 J
 Standard uncertainty  0.000 000 000 0048 x 10-18 J
  Relative standard uncertainty  1.1 x 10-12
 Concise form  4.359 744 722 2060(48) x 10-18 J    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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