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CALCULATION OF PLASMA DIELECTRIC FUNCTION IN SEVERAL REGIONS OF FREQUENCY

The dimensionless parameter Ω(θ,Φ) is calculated for several low density plasmas as helium (He), neon (Ne), argon (Ar), tetrafluorocarbon (CF 4 ), xenon ( Xe) and hexafluorosulfure (SF 6 ) which are analysed separately in their conditions of ion temperature T, and electrical potential Φ). However, the varied magnitudes are the potential Φ, ion temperature T i and θ= T i /T e . The parameter Ω(θ,Φ) depends on dimensionless ratio θ where 0 0. If the dielectric function is negative the electromagnetic wave is totally reflected. However, the electron density effect on dielectric function is illustrated and the frequencies of two domains are separated and linked to the pulsation regions as known. Ion mass m i effect on Q (θ,Φ) and electron density effect on c, (ω) are also studied. The dispersion relation, medium retroactive index and e r versus Ω achieved this work.