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Effective secondary emission coefficient in a high-pressure noble gas

The back-scattering of secondary electrons toward the cathode in a high-density noble gas and the resulting effective secondary (electron) emission coefficient, ESEC, is evaluated using a kinetic approach. The behaviour of the ESEC in a mixture of noble gases is also discussed. The obtained results can be applied to different sources of secondary electrons - ions, photons, etc. We provide a comparison of obtained expressions with experiments.