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	Categories: Units of energy \| Constants Hartree energy The Hartree energy (symbol E_h) 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 Planck's constant, $m e$ is the electron rest mass $a 0$ is the Bohr radius Categories: Units of energy \| Constants

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