Article | REF: P2656 V1

Theory of molecular spectra

Author: Alain PETIT

Publication date: March 10, 2002, Review date: January 5, 2017 | Lire en français

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    2. Born-Oppenheimer approximation

    The Schrödinger equation for a molecule involves wave functions that depend on the nuclear and electro-nuclear coordinates. The first simplification therefore consists in separating the nuclear part and the electronic part into two distinct parts:

    Ψ = Ψ e (r i , R N ) χ N (R N )

    with :

    R N and r i
     : 
    respectively core and electron coordinates i.
    ...
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    Born-Oppenheimer approximation