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A hollow cathode discharge with a Ti cathode and a positively biased ring anode was operated in Ar + N2 or Ar + O2 gas mixtures. The energy distribution of plasma ions is investigated with the help of energy-resolved mass spectrometry. Singly and doubly charged Ar+ and Ar2+ ions and molecular N+2 or O+2 ions are the most abundant ionic species. The kinetic energy of all plasma ions is enhanced by a positive anode voltage.