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Diffusion of a dimer through a structured medium

✍ Scribed by Roberto A. Garza-López; Jayanta K. Rudra; John J. Kozak

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
355 KB
Volume
174
Category
Article
ISSN
0009-2614

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✦ Synopsis

We study the random motion of a dimer diffusing through a compartmentalized system, the spatial dimensions of which are comparable to the size of the diffusing species. By solving numerically the stochastic master equation, the transit time across the medium is determined. Two different motions of the dimer are considered. First, the dimer is assumed to execute purely translational displacements (only); second, a "tumbling* motion is studied by allowing the dimer to pivot about either end as it translates through the medium. For two choices of initial condition, the ratio of the transit time for tumbling versus translation is found to be sz 2.4 for the two segmented geometries considered here.

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