The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hartree-hertz relationship
 $(1 \ E_{\rm h})/h$
 Numerical value  6.579 683 920 502 x 1015 Hz
 Standard uncertainty  0.000 000 000 013 x 1015 Hz
  Relative standard uncertainty  1.9 x 10-12
 Concise form  6.579 683 920 502(13) 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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