Monte Carlo simulation of electron detachment properties for ${{\text{O}_{2}^{{}}}^{-}}$ ions in oxygen and oxygen:nitrogen mixtures

Abstract

Electron detachment properties of −O 2 ions in pure oxygen and oxygen:nitrogen mixtures have been studied by a Monte Carlo technique for the reduced electric fields up to 350 Td (1 Td = 10 −17 V•cm 2 ). Swarm parameters were calculated for unexcited and vibrationally excited − O 2 ions taking into account vibrational transfer and relaxation, charge transfer and electron detachment. The cross sections for vibrational transfer and relaxation in collisions between − O 2 ions and O 2 molecules were calculated on the basis of the statistical approach that had been successfully used in our previous work to simulate the effect of vibrational excitation and the effect of electric field on electron detachment. Good agreement between the calculated detachment rate and available measurements in oxygen were obtained over a wide range of reduced electric fields without using adjusted parameters. The method was used to calculate detachment rates in air and in some other oxygen:nitrogen mixtures and to study the effect of gas temperature on electron detachment.

Corrigendum: Experimentally derived rate coefficients for electron ionization, attachment and detachment as well as ion conversion in pure O2 and N2–O2 mixtures (2018 J. Phys. D: Appl. Phys. 51 355201)

“…The findings of Neill and Craggs [8] for pure O 2 agree with only a slight offset. As Ponomarev and Aleksandrov [57] model is based on data from Frommhold [53], their theoretical results differ from ours by two orders of magnitude.…”

“…Our value for ν O2 d /N seems to match the one of Neill and Craggs [8], yet contrasts strongly with that of Frommhold [53]. The theoretical values of Pancheshnyi [17] and Ponomarev and Aleksandrov [57] are based on Frommhold's results, which they use as input for their models. Ponomarev and Aleksandrov [57] discuss the discrepancy in between those two measurements [53,8] and judge the results of Frommhold more reliable, which they use as input for their further calculation.…”

“…The measurement in different gas mixtures in figure 8b shows that the rate is smallest for pure oxygen, and increases with increasing nitrogen content. The reference values from Moruzzi [54] [8,53,55,56,57,17]. The measurement of Frommhold [53] was referenced in fig.…”

“…The theoretical values of Pancheshnyi [17] and Ponomarev and Aleksandrov [57] are based on Frommhold's results, which they use as input for their models. Ponomarev and Aleksandrov [57] discuss the discrepancy in between those two measurements [53,8] and judge the results of Frommhold more reliable, which they use as input for their further calculation. In order to clarify the distinction between ν O d and ν 14, shows a lower relative and absolute increase, and remain three orders of magnitude smaller.…”

Effect of background ionization on plasma ignition dynamics

“…One is the randomness of the ignition process and the other one is the randomness of the propagation process. Most of the previous works have focused on the latter process 24,[35][36][37] whereas the streamer ignition process [38][39][40][41] has attracted less attention. The ignition delay time is a critical characteristic for better understanding of the influence of the background ionization level on the repetitive behavior of the streamers.…”