Abstract
When an ensemble of atoms, of density n 0, is kept at room temperature the collisions that occur are generally not energetic enough to result in ejection of any electrons. This situation is depicted in Fig. 2.1 for sample atoms consisting of an ionic core and only one bound electron. When energy is fed into the gas (Fig. 2.2) the atomic collisions become more violent and some atoms get ionized. The free electrons produced by such collisions can ionize further atoms or recombine with the ions. At a fixed temperature T an equilibrium will be formed with a certain density of electrons n e(T), ions n +(T) and atoms n 0 (T). Conservation of particles and charge requires n e = n + and n 0(T0) = n +(T)+n 0(T).
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Müller, A. (1991). Ion Formation Processes: Ionization in Ion-Electron Collisions. In: Mathur, D. (eds) Physics of Ion Impact Phenomena. Springer Series in Chemical Physics, vol 54. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84350-1_2
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