a photon is going to be absorbed by an electron located inside an atom to go from a lower energy level to a higher energy level

a similar photon is going to be absorbed by a molecule of atoms oscillating at a certain oscillation mode to make (the atoms inside the molecule) a transition to a higher oscillating mode .

both similar photons in the 2 cases they are same photons but the first absorbed by an electron and the similar second photon one is absorbed by a full molecule

in both cases the emitter is the same but the absorber of the photon is totally different , one is the electron that directly absorbs the photon and raises its potential energy or p.e+k.e and in the second case , the molecule absorbs the energy and transfers it to the atoms ,,

what is the receiver of the energy inside the molecule in the second case ???

how the molecule transfers this energy to the atoms ?

what is the transient behavior till reaching the full higher oscillating new mode of oscillation?