CCL: constrained DFT and diabatic states

 Sent to CCL by: Xing Yin []
 Dear all,
I'm learning constrained DFT to study electron transfer transitions now. I know that the results calculated by cDFT are usually called diabatic states. However, the diabatic states are usually defined as the states without vibronic couplings in non-adiabatic dynamics. Is there any rigorous proof that the diabatic states constructed by cDFT methods do no have (or only have minimal) vibornic couplings between them?
 Best wishes,