LL-Ch.3 Collisions - PowerPoint PPT Presentation

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LL-Ch.3 Collisions
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LL-Ch.3 Collisions

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  1. LL-Ch.3 Collisions JK LEE (Spring, 2006)

  2. Ch.3 Collisions ◎Why do we need collisions? ◎Types of Collisions 1)Elastic Collisions -Coul. Coll. (e-e, e-i, i-i ) -Polariz. Coll. (e-N, i-N) v 2)Inelastic Collisions(KE non-conserved) -Ionization Coll. -Excitation Coll. (Meta stable Neutral) -Charge Transfer a +

  3. ◎Collisions in Argon •The mean free path for ionizing electrons is comparable to source dimensions. •The electron-neutral ionization rate is uniform. •The eedf is a Maxwellian, with Te uniform. •Argon is used as a reference, with second order rate constants Kiz, Kexc, and Kel, and Resonant charge transfer of on Ar exceeds elastic scattering. The combined ion cross section is Large , and