The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Rydberg constant times c in Hz
$R_\infty c$
 Value  3.289 841 960 361 x 1015 Hz
 Standard uncertainty  0.000 000 000 022 x 1015 Hz
  Relative standard uncertainty   6.6 x 10-12
 Concise form  3.289 841 960 361(22) x 1015 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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