Table of Contents
SRX Physics
Volume 2010, Article ID 592051, 17 pages
Research Article

Ion Plasma Responses to External Electromagnetic Fields

TNO Defence, Security and Safety, BU Observation Systems, P. O. Box 96864, 2509 JG The Hague, The Netherlands

Received 20 August 2009; Accepted 30 September 2009

Copyright © 2010 H. W. L. Naus. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The response of ion plasmas to external radiation fields is investigated in a quantum mechanical formalism. We focus on the total electric field within the plasma. For general bandpass signals three frequency regions can be distinguished in terms of the plasma frequency. For low frequencies, the external field is shielded. For high frequencies, the field is not modified. Resonant behavior of the plasma appears for frequencies near the plasma frequency: large internal electric fields and induced currents are present. These effects may be relevant for biological systems. The model is therefore extended to a two-species plasma and additional interactions are studied. The response is not essentially altered. To make the models more realistic, a so-called bath is included. In the weak coupling approximation the resonance frequency is shifted and some damping occurs. Finite temperature effects on the electric field are absent. The energy of the system, however, depends on temperature.