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A search for the production of the 2p/sup 2/ /sup 3/P/sup e/ state of H/sup -/ has been made by crossing a H/sup -/(1s/sup 2/) ion beam of energies E<140 keV with a thermal Hg beam inside a static electric field. The formation of H/sup -/(2p/sup 2/) ions and their subsequent decay to neutral H(1s) results in a feature on the angular distribution of the neutral particles produced in electron loss of the ground-state H/sup -/(1s/sup 2/) ions. The absence of such a feature sets an upper limit of 10/sup -20/ cm/sup 2/ to the cross section for formation of the 2p/sup 2/ /sup 3/P/sup e/ state. Differential (with respect to angle) charge-transfer cross sections for scattering in the angular range 3/sup 0/

Charge-exchange processes of hydrogen ions with Hg atoms at keV energies