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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High-resolution measurements for the dissociative recombination of Hi + (v =0) are presented and compared with theoretical calculations. The observed structure is explained with a model that invokes the coupling to intermediate electronic states belonging to two separate Rydberg series.

Dissociative recombination of H3+( nu =0) leading to H2++H- has been measured and the results are found to agree with earlier measurements by Peart et al (1979). A discussion is given on the measurement of recombination reactions using beam techniques.