The adiabatic approximation in the form (5.17) or (5.19) allows one to eliminate the high-frequency modes and to concentrate only on the low-frequency motion. The most frequent particular case of adiabatic approximation is the vibrationally adiabatic potential [Pg.77]

Now, we may observe that for weak H-bonds, it is possible to perform an adiabatic separation between the motions of the high and low frequency stretching modes that will allow us to treat many important situations that cannot be handled beyond this approximation, within the straightforward approach of Section II.B. [Pg.262]

Y. Miwa, H. Ishida, H. Saito, M. Tanaka, A. Mochizuki, Network structures and dynamics of dry and swollen poly(actylate)s. characterization of high- and low-frequency motions as revealed by suppressed or recovered intensities (SRI) analysis of C NMR, Polymer 50 (2009) 6091-6099. [Pg.57]

Figure 7.17 Dielectric relaxation spectrum of a 21 kDa triblock copolymer (58 g/1 in hexadecane) in which the central 3 kDa is the type-A c -polyisoprene and the two terminal ends are 8 kDa dielectrically inert polybutadienes, using original measurements by Adachi, et al.(2). The high- and low-frequency features are here interpreted as segmental motion and whole-chain reorientation, respectively. |

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