... Levin21Laboratory of Cell Biology, National Heart, Lung, and Blood Institute and 2Laboratory of Chemical Physics,National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, ... spectroscopic bandwidths are functions of dynamic parameters derived from intermolecular and intramolecular motions. Band shapes are often analyzed inthe context of statistical mechanical theories of irreversibleprocesses. ... I modes of the a-helices), 1680 cm)1(the amide I of b-turn structures), 1640 cm)1(the amide I of random coil and b-sheet structures), 1545 cm)1(the amide II of a-helical A mode), and 1520...