Quantum Dynamics script for the time evolution of the wavepacket in the case of the Tully article
The full quantum evolution of a wavepacket is evaluated in the case of the first type model in the article Tully, J.C. J. Chem. Phys. (1990) 93 1061.
In particular, the Adiabatic case is transformed into the adiabatic case, the UNitary time evolution operator is managed using the Trotter decomposition formula and the Kinetic Energy Operator is handled in the Fourier space.
The full code has been written in Python 3.7 by means of the conda notebook. numpy is needed for a correct execution of the code.