And large-amplitude motions

The temperature dependent spectra of PBLG-d5 is shown in Fig. 6. Line shapes below — 76°C are similar to the rigid state pattern, indicating the absence of fast and large-amplitude motions. They are, however, different in... 

Makarewicz, J., Ha, T.-K., and Bander, A., Potential energy surface and large amplitude motions of the water-carbon dioxide complex, J. Chem. Phys. 99, 3694-3699 (1993). 

Important structure-sensitive properties of glasses limit the ultimate strength. A description must describe the crack-propagation, crazing, and fibrillation on fracture and plastic deformation. All of these create new external or internal surfaces, which are critically dependent on the conformation and large-amplitude motion of the macromolecules in relation to the new interfaces. Little more is discussed about this topic. The continually changing special literature on this rather empirical topic must be checked for further information. 

Potential Curves and Large Amplitude Motions. The study of non-rigid molecules is closely related to the study of conformational equilibria. The subject is discussed in recent review papers, but the topic seems so important that a short discussion is given here cf. also Chapter 4). The idea of using electron diffraction to study internal motion is far from new some of the earlier studies are given in ref. 81. 

A virtually unique, and most interesting feature of van der Waals clusters is that such systems may exhibit strong anharmonic coupling between vibrational modes and large amplitude motions even in the ground state, or for the lowest excited states. 

Because molecules studied by NMR are not rigid isolated bodies, there will always be some effects due to the surrounding molecules and also due to small and large amplitude motions within the molecule. It may be necessary to correct for these effects. Alternatively, they can provide subtle information about the environment of a molecule as well as the dynamics of the intramolecular motional averaging that takes place in the NMR time scale. 

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