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electronvolt per hartree with units

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Jul 24, 2020, 6:28:07 PM
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on
May 7, 2014, 6:36:30 PM
Eh=27.21138505eVEh=27.21138505eV
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This constant relates the number of electronvolts in a hartree, EhEh.

The hartree, EhEh or Ha, is also known as the Hartree energy.  This constant represents the atomic unit of energy.

The hartree is directly related to several other fundamental physical constants.

EhEh = 2*RR*h*c, where

    RR - Rydberg constant
     h - Planck constant
     c - speed of light

The 2010 CODATA recommended value is Eh =  27.211 385 05(60) eV.

If you consider the inexact factors of the finite mass of the nucleus of the hydrogen atom and the relativistic factors, you can approximate the Hartree energy as the electric potential energy of the hydrogen atom in its ground state.

Notes

The Hartree energy has fundamental relationship so a number of other physical constants:

Eh=h2mea20=me(e24πε0h)2=mec2α2=hcαa0Eh=h2mea20=me(e24πε0h)2=mec2α2=hcαa0, where

  • h = Planck's constant
  • meme = electron rest mass
  • e = elementary charge of a proton
  • a0a0 = Bohr radius
  • ε0ε0 = electric constant or permittivity of free space
  • c = speed of light
  • αα = fine structure constant or coupling constant for electromagnetic interaction

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