Small Step Rotational Diffusion and Strong Collision Models

2 Small Step Rotational Diffusion and Strong Collision Models 

This section considers rotation models that allow explicit evaluation of Eq. (7.1). It is necessary to specify the transition operator in each 

The correlation functions encountered in many physical problems involve L = L = 1 or 2. In particular, only L = 2 is considered in magnetic resonance relaxation, while L = 1 is used in dielectric relaxation. For rodlike molecules in uniaxial mesophases, the correlation functions must be invariant for rotations about both the director and their long molecular axes. Consequently, they obey the relation (see also Section 5.2) 

A simplest transition rate R Cl Cl) is provided by the strong colhsion (or jump diffusion) model. 

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Small Step Rotational Diffusion and Strong Collision Models 183 the expansion coefficients are found to obey... 

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