Recombination of N+4 and N+3 with electrons in atmospheric pressure nitrogen

Dissociative recombination study of N3+: Cross section and branching fraction measurements

“…However, it cannot be ruled out that N 3 + was present even under such conditions. 20 The current measurements support such a conclusion, since the two-body recombination rate coefficient reported here is almost five times smaller than that reported for the total rate for the three competing processes. The second order rate coefficient increases with pressure due to the three-body recombination and decreases with pressure due to diffusion processes.…”

“…18,19 Due to the relatively high pressures, N 4 + was assumed to be the most dominant ion and its recombination with electrons dominated the electron loss. 20 It was concluded that the recombination could partly be diffusion controlled, due to the pressure dependence. The pressure independent rate constant reveals that three-body and diffusion controlled process are not important.…”

“…12 The situation became increasingly ambiguous when a subsequent theoretical calculation again predicted the C ϱv geometry of the X 3 ⌺ − state with r 12 = 1.43 Å and r 12 = 1.2 Å. 20 Due to the absence of information regarding the branching fractions and the ambiguous values reported for the reaction rate constant, we have performed an experiment at the storage ring CRYRING to shed light upon the DR of N 3 + . 14,15 Subsequent calculations have also supported those findings and predicted that the first adiabatic excitation energy of 0.87 eV leads to a cyclic closed-shell state with r = 1.33 Å.…”

Repopulation of Nitrogen Excited Triplet State Following Laser-Induced Filamentation

“…Bimolecular (or higher-order) processes can also participate in the repopulation of the excited triplet state. For example, electron recombination with the cation dimer, N 4 + , has been shown to populate N 2 (C 3 Π u ) − and both the cation species and the electron should be present at similar concentration. These species would decay according to bimolecular kinetics if there are no additional quenching processes for either the cation dimer or the electron.…”

“…Assuming the observed continuum emission is due to electron recombination with the cation dimer, the time dependence of the continuum intensity, I C , will contain information about the dynamics of the neutralization process (reaction viii in Scheme ). The rate constant for electron recombination with N 4 + has been reported to be k viii = 4 × 10 –6 cm 3 s –1 . Thus, after the initial production of N 4 + , integration of the second-order rate expression for reaction viii and rearranging leads to the expression describing the time course of the cation dimer density decay given by eq . italicI normalC ∝ [ N 4 + ] = [ e − ] ≅ false[ normale − false] 0 italick viii false[ normale − false] 0 italict + 1 …”