Abstract
We have used photon emission spectroscopy to determine absolute, state-selective cross sections for single-electron capture by ions colliding on atomic and molecular hydrogen. The impact energy was varied between 45 and . For collisions we find that the cross section for capture into the 2p3s state of strongly increases with impact energy up to an energy of . At higher impact energies the 2p3s cross section becomes comparable to the more or less constant 2p3p cross section. For the system these state-selective cross sections both stay approximately constant over the entire energy range investigated. Our results will be compared with existing experimental and theoretical data.
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