Slowly relaxing local structure model

A simple composite model of slow motions and molecular reorientations is the so-called slowly relaxing local structure model by Freed.156,157 This... 

Liang, Z., et al. (2000). An electron spin resonance study of DNA dynamics using the slowly relaxing local structure model. J. Phys. Chem. 104, 5372-5381. 

E. Two-Body Kramers Model Slowly Relaxing Local Structure... 

This is a two-body AFPE that is fully equivalent to those described by Stillman and Freed, including both a fluctuating torque effect (matrix f) and a slowly relaxing local structure (interaction potential V) the equivalence of the two approaches will be further investigated in the next section for the case of a planar model. 

NLSL.SRLS Performs fitting for multi-frequency ESR spectra using the Slowly Relaxing Local Structure (SRLS) model (Ref 26). 

An example of typical ESR spectra, measured in the first derivative mode, is shown in Fig. 12. Just like NMR, ESR can be used to detect phase transitions and to study the orientation and dynamics of liquid crystals. The spectra shown in Fig. 12, for example, are from a study comparing the dynamics of the spin label at the end of the polymer chain and the freely dissolved spin probe in a liquid-crystalline polyether by continuous wave ESR (Fig. 12) and 2D Fourier transform ESR experiments [137]. The end label showed smaller ordering and larger reorientational rates than the dissolved spin probe. Furthermore, it was demonstrated that the advanced 2D FT ESR experiments (see below) on the end-labeled polymer chain could not be explained by the conventional Brownian model of reorientation, although this model could explain the ID spectra. This led to the development of a new motional model of a slowly relaxing local structure, which enabled differentiation between the local internal modes experienced by the end label and the collective reorganization of the polymer molecules around the label. The latter was shown to be slower by two orders of magnitude. 

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