Time-resolved swarm studies in gases with emphasis on electron detachment and ion conversion

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

“…Therefore, we restrict the model to a simpler approximation, which is shown in figure 3. It was originally proposed by Verhaart and van der Laan [8], and further developed by Wen and Wetzer [10,38]. A partial analytical solution is available; however, it is unsuitable for rate fitting, since some terms are only given in integral form.…”

“…For simpler models without detachment, the effective electron growth rate is given as ν i − ν a . When including detachment and conversion processes, the 'effective rate' is calculated as [8,38]…”

“…In [38], a partial analytical solution for the model at hand is given, against which the simulation can be compared. The spatial densities of electrons and negative unstable ions (yet not positive and stable negative ions) can be calculated for any time-point.…”