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In measured pick-up ion spectra a special spectral feature has been identified on the high side of the pick-up ion injection energy which cannot be explained as due to energy diffusion of primary pick-up protons originating from ionized interstellar H-atoms. As we can show, however, in the following article, this feature can be explained as a secondary pickup ion feature due to ions originating from the charge exchange ionization of energetic neutral H-atoms entering the inner heliosphere anddoi:10.1051/0004-6361:20030238 fatcat:kxsp3fmm7vg2jfnabazaiea3d4