Stopping of Slow Projectiles in Electron Gas

New analytical formulas for the electronic stopping power and the energy loss straggling of low velocity extended charge projectiles in the degenerate electron gas are calculated within the dielectric function method. The stopping and straggling effective charges Z_eff of a projectile were analysed. They are found to differ one from the other and to depend on the electron gas density r_s, on the projectile atomic number Z_i and on the projectile degree of ionization ζ. For small Z_i, due to antiscreening Z_eff > 1.