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FIZIKA A 13 (2004) 4 , 161-174
 
COLLECTIVE EFFECTS OF BOUND ELECTRONS, FREE ELECTRONS AND IONS IN
WAVE-PLASMA INTERACTION
S. N. PAULa,b,1, S. K. BHATTACHARYAc, S. MONDALd
and B. CHAKRABORTYb
aCentre for Science Education and Research, B-4, Shyamali
Housing Estate, Salt Lake City, Calcutta - 700064, India
bCentre for Plasma Studies, Faculty of Science, Jadavpur University, Calcutta -
700032, India
cDepartment of Physics, Meghnad Saha Institute of Technology, Near NRI Complex,
Calcutta - 700150, India
dPhysical Research Laboratory, Navrangpura, Ahmedabad, India
1E-mail address: sailenpaul@rediffmail.com
Received 2 August 2004; Accepted 13 December 2004
Online 7 February 2005
Characteristics of propagation of small-amplitude waves in a cold plasma, assumed to be
fluid-like, compressible, and a mixture of populations of weakly bound electrons, free
electrons and ions, is studied. For an elliptically polarized wave, we have evaluated (i)
the zeroth-harmonic magnetic moment, (ii) the damping factor and cut-off frequency and
(iii) the collisional energy absorption. The relative roles of the frequency (w0 ) of the bound electrons, the characteristic frequency
of free electrons (wf ),
the characteristic frequency of bound electrons (wb) and the resonance condition, where w0
equals the wave frequency w, and the effects of the cut-off
frequency, is studied. The cut-off frequency has a higher value; in the resonance case (w2 = w02
) it increases when w0 is greater than wf, and decreases when w0 is less than wf. The field of magnetic-moment at this resonance is enhanced
when w0 is large compared to wf. The exchange of energy between the wave field and the
constituents of this plasma is considered.
PACS numbers: 52.40 Dg, 52.40 Db, 52.25Vy
UDC 531.327, 537.52
Keywords: bound electrons, wave-plasma interaction, cut-off frequency, field of
magnetic moment field
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