Abstract
We report an electron-beam study of dissociative attachment from excited hydrogen in the energy range of 1-5 eV. A marked dependence of H−/H2 and D−/D2 cross sections on initial vibrational (v=0−5) and rotational (j=0−7) states is observed. These results provide a new mechanism to interpret the anomalous H− density recently observed in a hydrogen plasma.

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