Franklin, R. N.
The dual frequency radio-frequency sheath revisited.
Journal of Physics D: Applied Physics, 36(21)
A recent paper (Riboche et al 2003) gave a treatment of this problem as a generalization of earlier work by Lieberman (1988). The expressions produced are intrinsically complicated and there is a natural tendency to resort to numerical methods at an early stage. This note adopts an alternative approach and seeks to evaluate the integrals concerned in a systematic manner so as to obtain analytical expressions, albeit approximations, but ones with known accuracy.
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