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@@ -30,3 +30,29 @@ $
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Zur Loesung einfacher Molekuele wird die LCAO-Methode genutzt um das Molekuelorbital durch eine Linearkombination zu modellieren.
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Helium kann durch Kombination aus $phi_(A) "und" phio_(B) $ dargestellt werden.
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Das H-atom wird dargestellt als Kombination aus $phi_(A) and phi_(B) $.
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Zeitunabhaengiger Hamilton-Operator
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$
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- planck.reduce ^2 / (2 m ) arrow(nabla) _(e) ^2 - (e ^2 ) / (4 pi epsilon_0 ) (1/r_(A) + 1/r_(B) - 1/R ) phi = E phi.
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$
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Ansatz
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$
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psi (arrow(r), R) = c_(A) phi_(A) (arrow(r)_(A) ) + c_(B) phi_(B) (arrow(r)_(B) ) \
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phi_(i) (arrow(r)) = phi_(i) (arrow(r )_(i) ) = 1/(sqrt(pi a_0 ^3 )) e ^( - r_(i) /a_0 ) \, space a_0 = "const."
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$
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Die gesamte Wellenfunktion ist normiert
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$
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integral abs(psi)^2 dif ^3 r = 1.
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$
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Das Ueberlappungsintegral ist gegeben durch
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$
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S_(A B) = R_0 integral phi_(A) ^(star ) phi_(B) dif ^3 r.
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$
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Das Helium Ion ist symmetrisch, also
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$
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H_(A A) = H_(B B) \
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c_(A) = +- c_(B).
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$
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