At higher frequencies, specifically those between approximately 3-6 THz, the dynamics occurring in the region involve more local motions that are simultaneously coupled to external librations. For example, a number of modes represent hindered translations and rotations with a simultaneous intramolecular component, such as an OH bond stretch. While this region involves all of the various water molecules, a majority of the modes consist of motions from the more strongly-bound waters, i.e. those having multiple hydrogen bonding interactions with the polymer helices. As the frequency of the transitions increase, the modes become increasingly more localized. For example, a major feature observed in the hydrated spectrum around 5.9 THz corresponds to an intermolecular water libration coupled with a simultaneous O-H bond stretch, as well as concomitant motion of the polymer backbone. The highest frequency modes, those occurring above 6 THz, involve much more localized motions of the water molecules, and specifically those waters that are strongly interacting with the polymer backbone via hydrogen bonds and spatial proximity. For example, one of the significant features occurring near 8.5 THz involves concerted H-O-H bending and O-H stretching along the hydrogen bonding coordinate between the water molecules and the polymer backbone.