The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Rydberg constant times hc in J
 $ hcR_\infty = \alpha^2 m_{\rm e} c^2/2 $
 Numerical value  2.179 872 361 1030 x 10-18 J
 Standard uncertainty  0.000 000 000 0024 x 10-18 J
  Relative standard uncertainty  1.1 x 10-12
 Concise form  2.179 872 361 1030(24) 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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