The adiabatic approximation in the ground-state manifold

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Abstract
The adiabatic approximation to vibronic interactions, and its relation to the crude adiabatic and other methods, need careful scrutiny when applied to processes where both participating states belong to the same electronic manifold. The processes include vibrational transitions by both electronic and magnetic mechanisms, and the property of vibrational circular dichroism in chiral systems. When moments and properties are calculated, general questions of dependence on the chosen origin of coordinates have to be resolved. These problems are examined.

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