Quantum theory of hydrogen recombination

A fully quantum mechanical treatment is presented of the three-body recombination process H + H + 4 He → H 2 + 4 He for T = 1 K where measurements have recently been performed. The calculation employs accurate interatomic potentials and thermal averaging. An impulse approximation is used to obtain the most important contributions to the rate constant. Off-shell effects are found to be important and are included in the final results which are in …