The first measurement is reported of the absolute cross section as a function of kinetic energy for a process involving a state-selected excited reactant, namely near-resonant H⁺-Na(3p) charge exchange. The ion-beam experiments show enhanced production of Lα from H⁺-Na when the sodium is irradiated with laser light tuned to a D line. The results presented here demonstrate unambiguously that of H⁺, H₂⁺, and H₃⁺, only H⁺ leads to enhancement; however, the effect occurs only for energies below 30 eV.
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Kushawaha et al. (1980) studied this question.
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