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 absolute value of binding energy of the electron in the ground state of the hydrogen atom |W1| or the ionization energy.
E_h = {\hbar^2 \over {m_e a^2_0}}
= 4.359 743 81(34) × 10-18 J = 27.214 4 eV = 2 Ry
where:
\hbar is the Dirac's constant,
m_e is the electron rest mass
a_0 is the Bohr radius

 

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