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Description:
The Born-Oppenheimer approximation fails when two electron states almost cross, also known as an “avoided crossing.” An avoided crossing is illustrated in the above plot of adiabatic electronic energy as a function of R. (Figure by Prof. Troy Van Voorhis.)
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5-73f05.jpg
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Illustration of an avoided crossing.
Caption:
The Born-Oppenheimer approximation fails when two electron states almost cross, also known as an “avoided crossing.” An avoided crossing is illustrated in the above plot of adiabatic electronic energy as a function of R. (Figure by Prof. Troy Van Voorhis.)
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