Calculations of ion-ion recombination rates at high pressures

The classical theory of ion-ion recombination in gases of high density is extended to allow for arbitrary ratios of the masses of the three species involved. Calculations are performed for the recombination of Ar+, Ar+2, Kr+, and Kr+2 ions with F− and of Hg+ and Ar+ with Cl− in an argon gas. The effective two-body rates peak between 2×10−6 and 3×10−6 cm3 sec−1 at pressures above 1 atm.