In computational investigations of photoinduced reactions and processes, similar to experimental approaches, initial steps often involve characterizing the Franck-Condon region. This entails understanding the energetic and electronic nature of excited states within the framework of the Born-Oppenheimer approximation. Typically, this is achieved by computing vertical transition energies (E abs ) and oscillator strengths (f ). These parameters quantify the electronic absorption characteristics, whereas the latter is obtained by calculating the energy difference between two electronic states (i and j) and the 2-norm of the correspond-ing transition dipole moments (µ ij ), as given in Equation ( ).