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
|
W
1
| 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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