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Analysis of a kinematic model for ion transport in rf plasma sheaths

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type:学術雑誌論文 Journal Article

Rida T. Farouki, Satoshi Hamaguchi, and Manoj Dalvie, Phys. Rev. A 45, 5913, 1992

An idealized model for ion transport across an oscillating plasma sheath is analyzed to obtain insight into qualitative features of the ion energy distributions observed in low-pressure rf discharges. The sheath is characterized by a constant electric field over an extent that varies sinusoidally with time, and ions incident on it correspond to a monoenergetic flux independent of phase in the rf cycle. The dimensionless parameters =qVs/m2d2 and =v0/d (where d and Vs are the mean sheath thickness and potential drop, is the excitation frequency, and v0 and q/m are the incoming ion speed and charge-to-mass ratio) govern the ion trajectories, which are found to divide into groups, delimited by two critical values of , that undergo N and N+1 encounters with the field. The first critical phase depends only weakly on , whereas the second is sensitive to both and and cycles continuously as these parameters diminish. Correspondingly, within the transition regime where and are neither very small nor greater than (or comparable to) unity, the precise form of the incident-ion energy spectrum exhibits rapid variations, superposed on a systematic narrowing, as the frequency is increased. © 1992 The American Physical Society.

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  • Physical Review A

    Physical Review A 45 (8), 5913-5928, 1992-04

    American Physical Society

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