Intermediate normalization cannot represent the geometric phase effect: the reference component of the exact wave function must vanish on loops enclosing a conical intersection, causing divergences in coupled cluster and Møller-Plesset expansions.
Helgaker , author P
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Understanding failures in electronic structure methods arising from the geometric phase effect
Intermediate normalization cannot represent the geometric phase effect: the reference component of the exact wave function must vanish on loops enclosing a conical intersection, causing divergences in coupled cluster and Møller-Plesset expansions.