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Hartree energy

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 binding energy of the electron in the ground state of the hydrogen atom.

<math>E_h = {\hbar^2 \over {m_e a^2_0}}</math>
= 4.359 743 81(34) x 10-18J

where:

<math>\hbar</math> is the Dirac's constant,
<math>m_e</math> is the electron rest mass
<math>a_0</math> is the Bohr radius



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