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|Author(s):||MVVS. Rao; Richard J. Van Brunt; James K. Olthoff;|
|Title:||Kinetic-energy Distributions of Positive and Negative Ions in Townsend Discharges in Oxygen|
|Published:||April 01, 1999|
|Abstract:||Translational flux-energy distributions of positive and negative ions have been measured at high electric field-to-gas density ratios (E/N) up to 40 x 10-18 V m2 (40 kTd) in diffuse, parallel-plate Townsend discharges in oxygen using an ion energy analyzer-mass spectrometer. The O2+ ion is the most abundant ion detected in the discharge, and exhibits Maxwellian energy distributions for E/N < 20 x 10 -18 V m2, which is consistent with predictions based upon the assumption that resonant symmetric charge exchange is the dominant ion-molecule collision process. The less abundant ions, O+, O2-, and O-, exhibit non-Mawellian ion kinetic energy distributions at nearly all E/N, indicative of multiple ion-molecule reactions affecting the ion transport. Mean energies are obtained for each ion as a function of E/N from analysis of the energy distributions, and symmetric charge-exchange cross sections are calculated from the data where appropriate.|
|Citation:||Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)|
|Pages:||pp. 4565 - 4572|
|Keywords:||cross-sections,ion-molecule reactions,kinetic-energy distributions,O2,oxygen,Townsend discharge|
|Research Areas:||Electronics & Telecommunications|
|PDF version:||Click here to retrieve PDF version of paper (7MB)|