The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of 1st hyperpolarizability
 $e^3a_0^3/E_{\rm h}^2$
 Value  3.206 361 329 x 10-53 C3 m3 J-2
 Standard uncertainty  0.000 000 020 x 10-53 C3 m3 J-2
  Relative standard uncertainty   6.2 x 10-9
 Concise form  3.206 361 329(20) x 10-53 C3 m3 J-2    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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