Mean energy losses of foil-transmitted H2+ ions are measured for the incidence of 9.6-MeV/amu H2+ ions on carbon foils of 1.5-8.5 μg/cm2 thickness. The measured ions are those that have traversed the carbon foil without loss of their original electrons. The stopping power of carbon for 9.6-MeV/amu H2+ ions, derived from the energy losses, is 55.8±4.6 eV/(μg/cm2). The obtained stopping power is compared with that calculated with the first Born approximation. The calculated result is slightly larger than the experimental one.
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