| Autor: |
Jain R; Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India., Sebastian KL; Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India. |
| Abstrakt: |
We consider the problem of calculating the probability distribution function (pdf) of angular displacement for rotational diffusion in a crowded, rearranging medium. We use the diffusing diffusivity model and following our previous work on translational diffusion [R. Jain and K. L. Sebastian, J. Phys. Chem. B 120, 3988 (2016)], we show that the problem can be reduced to that of calculating the survival probability of a particle undergoing Brownian motion, in the presence of a sink. We use the approach to calculate the pdf for the rotational motion in two and three dimensions. We also propose new dimensionless, time dependent parameters, α rot,2D and α rot,3D , which can be used to analyze the experimental/simulation data to find the extent of deviation from the normal behavior, i.e., constant diffusivity, and obtain explicit analytical expressions for them, within our model. |
