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Spontaneous radiative recombination between protons and electrons to form hydrogen atoms with 8<«< 19 has been measured. CO2 laser light has been shown to induce stimulated radiative recombination to the /i = 11 and 12 levels with an inferred gain in the cross section of 1720 ±860 and 4790 ±2830 for a laser power of 12.6 and 15.3 W, respectively. This is in line with that predicted theoretically.

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Cross sections for the dissociative recombination of electrons and H2 + ions having low internal energies have been measured by means of the merged electron-ion beam technique. Narrow resonances associated with indirect capture into high-lying Rydberg states of the neutral molecule have been found. The use of ions with only two vibrational states significantly populated has allowed the high-resolution capability of the merged-beam technique to be clearly demonstrated.