Question

3. Earlier, we showed that by taking superpositions of states involved in spectroscopic transitions that a non-stationary term emerges in the probability overlap that oscillates at the frequency of the energy difference between the superposition components. This feature does not require light-matter interactions but it does provide a basis for explaining dynamical aspects of spectroscopic transitions which are governed by the size of the transition dipole moment integral.

Charge transfer transitions appear in many molecules, especially transition metal systems, where their intensity is dependent on the distance between nuclei centers. If the distance is too large, the charge transfer intensity goes to zero because there is no overlap between orbitals. Explain this effect in terms of the superposition approach with attention to the interference term.

Answer 1