Pascal Chabert's Physics of Radio-Frequency Plasmas PDF

By Pascal Chabert

ISBN-10: 0521763002

ISBN-13: 9780521763004

Low-temperature radio frequency plasmas are crucial in a variety of sectors of complex know-how, from micro-engineering to spacecraft propulsion structures and effective resources of sunshine. the topic lies on the advanced interfaces among physics, chemistry and engineering. Focusing totally on physics, this e-book will curiosity graduate scholars and researchers in utilized physics and electric engineering. The booklet contains a state-of-the-art viewpoint on RF plasmas. It additionally covers easy plasma physics together with delivery in bounded plasmas and electric diagnostics. Its pedagogic kind engages readers, aiding them to advance actual arguments and mathematical analyses. labored examples follow the theories lined to reasonable situations, and over a hundred in-text questions enable readers positioned their newly obtained wisdom to take advantage of and achieve self belief in using physics to genuine laboratory occasions.

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Taking the example of vibrations, we have e− + Cl2 (v = 0) → Cl2 (v = 1) + e− , e− + Cl2 (v = 0) → Cl2 (v = 2) + e− , e− + Cl2 (v = 1) → Cl2 (v = 2) + e− , etc. The energy difference between two vibrational levels is significantly less than 1 eV, so that a very large fraction of the electron population can experience such inelastic collisions. The reaction rate for vibrational excitation is therefore high and vibrational excited states may play a rˆole in the discharge equilibrium. In particular, the vibrational energy can be coupled to translational motion, leading to significant neutral gas heating [26].

67) The last term describes damping, arising in this case from elastic collisions, and may be neglected at low pressure. This relation was obtained by Bohm and Gross [240]. At large k, the electron plasma wave propagates at constant speed, ve , and at small k they become constant-frequency waves at ωpe (note that this dispersion relation has a similar form to the electromagnetic wave dispersion relation, except that the latter propagate at the speed of light at large k). The phase speed 52 Plasma dynamics and equilibrium ω/k is given by vφ = ve 1 + 1/2 1 2 k λ2D .

A Eq. 27) shows Kiz to be of Arrhenius (thermally activated) form. In the steady state Kiz (Te ) = wall ne 1 A . 41) The LHS is an exponential function of Te . On the RHS, the wall flux is likely to be proportional to the mean electron density, so the electron density dependence vanishes; however, the gas density ng is proportional to gas pressure. Hence the electron temperature is linked to the gas pressure and the system size. In the case of an electronegative plasma, one would also need to consider attachment and detachment processes that capture and liberate electrons in the volume.

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Physics of Radio-Frequency Plasmas by Pascal Chabert

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