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Exact solution of Smoluchowski’s equation for reorientational motion in Maier–Saupe potential

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  • Sitnitsky, A.E.

Abstract

The analytic treatment of the non-inertial rotational diffusion equation, i.e., of Smoluchowski’s one (SE), in a symmetric genuinely double-well Maier–Saupe uniaxial potential of mean torque is considered. Such potential may find applications to reorientations of the fragments of structure in polymers and proteins. We obtain the exact solution of SE via the confluent Heun’s function. The solution is uniformly valid for any barrier height. We apply the obtained solution to the calculation of the mean first passage time and the longitudinal correlation time and obtain their precise dependence on the barrier height. In the intermediate to high barrier (low temperature) region the results of our approach are in full agreement with those of the approach developed by Coffey, Kalmykov, Déjardin and their coauthors. In the low barrier (high temperature) region our results noticeably distinguish from the predictions of the literature formula and give appreciably greater values for the transition rates from the potential well. The reason is that the above mentioned formula is obtained in the stationary limit. We conclude that for very small barrier heights the transient dynamics plays a crucial role and has to be taken into account explicitly. When this requirement is satisfied (as, e.g, at the calculation of the longitudinal correlation time) we obtain absolute identity of our results with the literature formula in the whole range of barrier heights. The drawbacks of our approach are its applicability only to the symmetric potential and its inability to yield an analytical expression for the smallest non-vanishing eigenvalue.

Suggested Citation

  • Sitnitsky, A.E., 2015. "Exact solution of Smoluchowski’s equation for reorientational motion in Maier–Saupe potential," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 419(C), pages 373-384.
  • Handle: RePEc:eee:phsmap:v:419:y:2015:i:c:p:373-384
    DOI: 10.1016/j.physa.2014.10.034
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    References listed on IDEAS

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    1. Coffey, W.T. & Crothers, D.S.F. & Titov, S.V., 2001. "Escape times for rigid Brownian rotators in a bistable potential from the time evolution of the Green function and the characteristic time of the probability evolution," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 298(3), pages 330-350.
    2. Coffey, William T. & Kalmykov, Yury P. & Ouari, Bachir & Titov, Sergey V., 2006. "Rotational diffusion and orientation relaxation of rodlike molecules in a biaxial liquid crystal phase," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 368(2), pages 362-376.
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    Cited by:

    1. Sitnitsky, A.E., 2016. "Probability distribution function for reorientations in Maier–Saupe potential," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 452(C), pages 220-228.

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