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, kr, 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 kr, 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.