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## Main Question or Discussion Point

I am very interested in calculating the vibronic couplings of a particular system quantitatively, but I am very new to Quantum Physics... so I will highly appreciate your guidance on where to start from? What kind of mathematics do I need to learn?

I am quite puzzled because If I have understood correctly, The Born-Oppenheimer approximation of schrodinger eq can't evaluate the vibronic couplings...!

Is it possible to use QED? does it make the problem simpler?

Thanks in advance.

I am quite puzzled because If I have understood correctly, The Born-Oppenheimer approximation of schrodinger eq can't evaluate the vibronic couplings...!

Is it possible to use QED? does it make the problem simpler?

Thanks in advance.