London–Eyring–Polanyi (LEP) method, 861 London–Eyring–Polanyi–Sato (LEPS) method, 861 lone (electron) pair, 861 long chain, 861 long spacing in polymer crystals , 861 long-lived collision complex, 862 long-range intramolecular interaction in polymers , 862 longitudinal order in a polymer , 862 loose end, 862 Lorentz broadening [obsolete] of a spectral line , 862