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Starting from the exact formulation of the electric microfield distribution in an electron gas the question is investigated of whether collective phenomena are correctly included in previous calculations. Application of Böhm and Pines' procedure yields a separable expression for the total microfield distribution: the collective component is represented by a Gaussian distribution, the individual component is similar to the high-frequency profile of Baranger and Mozer. Both components vary with the cut-off parameter of the spectrum of the collective modes. For realistic values of this cut-off parameter the total distribution may differ from the high-frequency profile as much as ten per cent for systems close to the critical density. With increasing plasma parameter Λ the distribution approaches that of Holtsmark

Individual and Collective Aspects of the Microfield Distribution