SIMION®
The field and particle trajectory simulator
Industry standard charged particle optics software
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SIMION 8.0 Issues/Bugs/Enhancements

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Issue I494 [enhancement,constants]
  Update constants to CODATA2010.

  In SIMION 6.0/7.0/8.0, the constants are essentially CODATA1986
  values (see http://en.wikipedia.org/wiki/CODATA ).
  Dahl2000 notes "The physical constants used in version 6.0 and 7.0
  are from the 74th edition of the CRC Handbook of Chemistry and
  Physics [12] Values of these physical constants (e.g. c, electron
  mass, and elementary charge) are defined to 8 or 9 significant place
  accuracy".  The 74th edition (1993-1994) uses CODATA1986, which were
  the latest CODATA values at that time.  SIMION 8.0 also uses these
  constants.
  
  In SIMION 8.1.0, constants are now CODATA2010.
  Resolved in 8.1.0-TEST3.

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