Molecular Processes in Plasmas pp 21-37 | Cite as

# Collision Cross-Sections and Related Quantities

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Consider a collision between particles A and B (see Fig. 3.1). Here B is a target fixed in space and A is a projectile incident along *z*-axis. (Collisions between two moving particles are treated in Sect. 3.4.) The flux of the incident particle is denoted by *j*in. The number of particles coming out per unit time and per unit solid angle in the direction (*θ, φ*) is denoted by *J*out(*θ, φ*). (Note that Fig. 3.1 shows a case of axial symmetry and the *φ*-dependence is omitted.) The quantity *J*out is proportional to the incident flux *j*in.

## Keywords

Collision Process Incident Particle Collision Time Electron Collision Electron Energy Distribution Function
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© Springer-Verlag Berlin Heidelberg 2007