INFLUENCE OF THE FIRST-ORDER POLARIZATION ON THE STOPPING POWER FOR BARE CHARGES IN THE JELLIUM MODEL

Adding the contribution of the next higher order of the density parame ter to the random-phase approximation (the zeroth-order, noninteractin g approximation to the susceptibility) improves the calculation of the linear dielectric function of the jellium model. In this paper, the c orresponding results by Holas, Aravind, and Singwi [Phys. Rev. B 20 49 12 (1979)] are picked up to extend the Lindhard-Winther theory of the electronic energy loss in a straightforward manner. As known from stat ic approximations to the local-field correction, the electronic stoppi ng at low ion velocities is enhanced. Above the stopping-power maximum , the first-order dynamic dielectric function delivers a correction of the opposite sign.