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The hartree (symbol: ''E''h or Ha), also known as the Hartree energy, is the atomic unit of energy, named after the British physicist Douglas Hartree. It is defined as 2''R''∞''hc'', where ''R''∞ is the Rydberg constant, ''h'' is the Planck constant and ''c'' is the speed of light. The 2010 CODATA recommended value is ''E''h = = .〔(CODATA2010 )〕 The 2006 CODATA recommended value was ''E''h = = . The hartree energy is approximately the electric potential energy of the hydrogen atom in its ground state and, by the virial theorem, approximately twice its ionization energy; the relationships are not exact because of the finite mass of the nucleus of the hydrogen atom and relativistic corrections. The hartree is usually used as a unit of energy in atomic physics and computational chemistry: for experimental measurements at the atomic scale, the electronvolt (eV) or the reciprocal centimetre (cm−1) are much more widely used. ==Other relationships== : ::= 2 Ry ::≜ 4.359 744 34(19) J ::≜ 27.211 385 05(60) eV ::≜ 2625.499 62 kJ/mol ::≜ 627.509 469 kcal/mol ::≜ 219 474.631 3705(15) cm−1 ::≜ 6 579.683 920 729(33) THz ::≜ 3.157 746 46 x 105 K where: :''ħ'' is the reduced Planck constant, :''m''e is the electron rest mass, :''e'' is the elementary charge, :''a''0 is the Bohr radius, :''ε''0 is the electric constant, :''c'' is the speed of light in vacuum, and :''α'' is the fine structure constant. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hartree」の詳細全文を読む スポンサード リンク
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