A heavy ion in a fluid in presence of an electromagnetic field seen as an ordinary Brownian motion |
| |
Authors: | JI Jiménez-Aquino M Romero-Bastida |
| |
Institution: | Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, Apartado Postal 55-534, C.P. 09340 México, D.F., México |
| |
Abstract: | An alternative method of how to characterize, at equilibrium, the diffusion process of a Brownian charged particle (heavy ion) in a fluid in presence of an electromagnetic field is presented. The theory is formulated via a Langevin equation associated with the ion's velocity vector, which is transformed to another velocity-space in which the diffusion process is quite similar to that of the ordinary Brownian motion. The diffusion process is characterized, in absence and in presence of the electric field, through the mean square displacement in the transformed configuration-space and then returned to the original variables, by means of the corresponding transformation. Under the action of the electric field, the diffusion process is studied for a general time-dependent electric field. Explicit results are obtained for a constant and oscillating electric field. |
| |
Keywords: | 05 40 &minus a |
本文献已被 ScienceDirect 等数据库收录! |
|