The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hartree-electron volt relationship
$1 \ E_{\rm h}$
 Value  27.211 383 86 eV
 Standard uncertainty   0.000 000 68 eV
  Relative standard uncertainty   2.5 x 10-8
 Concise form  27.211 383 86(68) eV    
 
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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