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The Hartree energy (symbol Eh) is a physical constant used as atomic unit of energy, named after physicist Douglas Hartree .It has a value of twice the absolute value of binding energy of the electron in the ground state of the hydrogen atom |W1| or the ionization energy.
-
- = 4.359 743 81(34) × 10-18 J = 27.214 4 eV = 2 Ry
where:
- is the Dirac's constant,
- is the electron rest mass
- is the Bohr radiusIn Bohr's model of the hydrogen atom, the Bohr radius is the radius of the lowest energy orbit: where: : is the permittivity of vacuum : is Dirac's constant or the "reduced Planck's constant" : is the electron rest mass and : is the elementary charge It h
Units of energy
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