[en] Neutral fluxes to the wall of ASDEX were measured with a new energy-resolving carbon resistance probe, CRP, combined with a mechanical shutter, providing time resolution. With the new CRP having two silicon overlayers of different thickness the non-Maxwellian energy distribution of the charge exchange neutrals can be approximately determined. Using the flux and the mean energy of the particles from the resistance probe measurements, one can calculate the flux of impurities generated by sputtering. Various discharges were investigated. High impurity fluxes were observed in discharges with high power auxiliary heating. Low impurity fluxes were observed in pellet-refuelled discharges and during neutral beam heating in counter direction and H-mode discharges refuelled with pellets. Charge exchange neutral sputtering is an important impurity source representing a lower limit for impurity generation. 20 refs., 3 figs