Collisional detachment of electrons and ion molecule reactions in oxygen

Abstract

Collisional detachment in oxygen was studied for pressures of about 20-60 Torr and with mass analysis which also allowed conversion rates to be calculated. For O-, delta 1/N (detachment coefficient/gas density) was found to be about 5*10-18 cm2 at E/N (field strength/gas density) of about 50 Td where for O2 -, delta 2/N approximately 1*10-18 cm2. The need for an accurate measurement of the conversion rate for O- to O2 - is emphasized.

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)

“…We report rate coefficients for several processes in N 2 -O 2 gas mixtures for the first time. In case of the detachment from O − 2 our results support the results of Neill and Craggs [8], while disagreeing with those of Frommhold [9]. We briefly review the experimental setup and fitting routine in sections 2 and 4.…”

“…The main extension is the explicit simulation of three negative ion species: O − , O − 2 and O − 3 . Similar models with slight variation have been used by various au-thors [17,10,22,23,24,8,25,26,12] for O 2 and N 2 − O 2 mixtures.…”

“…This publication aims at investigating the physical behaviour of N 2 and O 2 mixtures in order to predict and optimize their electric strength. On the subject of oxygen or air, various authors presented experimental [7,8,9,10,11,12,13,14,15,16] and theoretical work [17,18], which differ with regard to the physical model. In a previous publication [19] we presented a literature review about the physical processes involved, and used a simplified model of van der Laan and Verhaart [20] with two negative ion species to fit our Pulsed Townsend measurements in dry air (79% N 2 and 21% O 2 ).…”

Measurement of ionization, attachment, detachment and charge transfer rate coefficients in dry air around the critical electric field

“…Similar kinetic schemes have been used by e.g. Zhao and Lin in N 2 − O 2 mixtures [20], and by O'Neill and Craggs in oxygen [21]. Electrons of kinetic energy above the ionization threshold can create, on impact, O + 2 (≈ 12 eV) and N + 2 (≈ 15.5 eV) ions:…”

Negative Ions, Ozone, and Metastable Components in dc Oxygen Glow Discharge

“…3b. K i n e t i c P r o b l e m in t h e P r e s s u r e R a n g e of p = 0.1 -2 T o r r Studies of the mechanisms of the formation of negative ions of oxygen a t low pressures have been carried out during the recent 30 years [2,27,[31][32][33][34][35]. These studies have 10%.…”