Theory of new states, FEXs, Fast-formed EXcited states by the combination of an IR photon and water.

In the IR spectra of water on polyethylene, polypropylene and polytetrafluoroethylene frequent and substantial negative peaks occurred and are explained by a theoretical analysis. New states, FEXs, Fast-formed EXcited states are formed by the combination of an IR photon and water and are now made manifest by inefficient energy transfer to the polymer combined with limited energy transfer to the small (0.5–1.0 μL) water sample.