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Real-Time Dynamics and Conical Intersections

This book chapter is a general introduction to photo-dynamics. An outlined structure to the theoretical studies on classical/quantum/mixed dynamics were described from the literature point of view. Such methods get constrained for the practical applications due to parametrizations/computational cost. As an alternate TDDFT-based dynamics studies are promising. we have shown that the TDDFT calculations could be as accurate as high quality monte-carlo calculations and the reliability of the TDDFT calculations for locating the conical intersection through the simple ring-opening reaction of oxirane. Pros and cons of TDDFT for photo-dynamics calculations have been presented for the development of this fast evolving field.