Vibrational contributions to intermolecular forces

The zero-point vibrational energies of molecules are affected by interactions, and these may lead to higher or to lower vibrational frequencies. At very high 

Resonance energy may play a significant role in the interaction of vibration-ally excited molecules with identical partners, leading to an exciton splitting, as in single crystals [44], and the sharing of the vibrational energy between the two molecules. 

---