Use of a rotating single probe in studies of ionization of additives to premixed flames. Part 5.—Recombination of metal ions with electrons

Abstract

Electrostatic probe measurements are reported on the recombination rate constant, k_r, or the process M⁺+ e^–X→M + X in premixed flames, for a number of metals M and (for M = Li) for the specific collision partners ×= H₂, Ar, CO, CO₂, H₂O, N₂. The results confirm, in all important respects, previous independent observations and inferences on this process, including the conclusion that the recombination cross-section is not markedly dependent on the nature of X. In addition, the sensitive probe procedure employed reveals aspects of k_r, with respect to dependence on no fewer than three variables, temperature, composition and ion concentration, which will require mass spectrometric investigation before they can be fully understood.