The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of 2nd hyperpolarizability
 $e^4a_0^4/E_{\rm h}^3$
 Value  6.235 380 085 x 10-65 C4 m4 J-3
 Standard uncertainty  0.000 000 077 x 10-65 C4 m4 J-3
  Relative standard uncertainty   1.2 x 10-8
 Concise form  6.235 380 085(77) x 10-65 C4 m4 J-3    
 
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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