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- W3661806 abstract "When modelling a partially ionized plasma, one is working with a set of rate equations, describing the production and destruction of the particle species occurring in the discharge (Hiskes, 1987; Gorse et al., 1987). Depending on the level of detail of the description, the number of interacting species can increase to a large number. An elementary description of a hydrogen plasma would involve molecules, H2, metastable molecules, H2 *, atoms, Ho, one type of ion, Hi +, and electrons. When more precision is required, one would have to replace the ion by H-, H+, H2 + and H3 +, and successively add more and more excited states, including both electronic and molecular excitations. The reaction rates occurring in the equations are expressions of the following form: $$ R = iint {sigma (left| {{{v}_{1}} - {{v}_{2}}} right|)(left| {{{v}_{1}} - {{v}_{2}}} right|){{F}^{a}}({{v}_{1}}){{F}^{b}}({{v}_{2}}){{d}^{3}}{{v}_{1}}{{d}^{3}}{{v}_{2}},} $$(1)where, σ, which is a function of the relative velocity |v1 - v2|, is the cross section describing the interaction between particles of species a and b, and Fa(v1) and Fb(v2) are their distribution functions. Equation (1) clarifies that an ideal diagnostic technique measures the complete distribution function of each particle species. Only then, a precise comparison between modelling and experimental results is possible. In the majority of discharges, however, the particles make a sufficient number of collisions for the distribution function to approach a Maxwellian. Then, a measurement of density and temperature would suffice. For two species of the same temperature T, Eq. (1) attains the much simpler form, $$ R = {{n}_{a}}{{n}_{b}}surd (8kT/pi mu )smallint sigma (E)exp ( - E)EdE, $$(2)where, n gives the densities of species a and b, respectively, E = (µv2/2kT) is the relative energy of motion with v the relative velocity, and µ is the reduced mass, µ = (ma + mb)/mamb." @default.
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- W3661806 date "1990-01-01" @default.
- W3661806 modified "2023-09-26" @default.
- W3661806 title "Laser Diagnostics of a Hydrogen Discharge" @default.
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- W3661806 doi "https://doi.org/10.1007/978-1-4615-3780-9_12" @default.
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