The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Rydberg constant times c in Hz
 $ cR_\infty = \alpha^2 m_{\rm e} c^2/2h $
 Numerical value  3.289 841 960 2508 x 1015 Hz
 Standard uncertainty  0.000 000 000 0064 x 1015 Hz
  Relative standard uncertainty  1.9 x 10-12
 Concise form  3.289 841 960 2508(64) x 1015 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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