Hellman-Feynman theorem

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Hellman-Feynman theorem [¦hel·mən ¦fīn·mən ‚thir·əm]

(quantum mechanics)

A theorem which states that in the Born-Oppenheimer approximation the forces on nuclei in molecules or solids are those which would arise electrostatically if the electron probability density were treated as a static distribution of negative electric charge.

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