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The authors calculate the value of the product E eff a for Ar surface-wave-produced plasmas at 2.45 GHz. This value has been found to be variable with pressure in the range of cases studied (low pressures up to 20 Torr). Such a variation is obtained as a consequence of empirical similarity laws existing for the effective electric field in the discharge and the reduced length of plasma columns as a function of the product pa.
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Sola et al. (1988) studied this question.
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