It is well known plasma frequency is a relevant material parameter, how difficult or easy is to have a direct experimental determination of such parameter?
Your question relevant and important both. In the case of gaseous plasmas, the plasma frequency could be determined with the help of a Langmuir probe, spectroscopic techniques, etc. In contrast, for a solid, the plasma frequency could be determined empirically with the knowledge of the electronic concentration (wp^2 ~. ne).
Some helpful References:
1. Hutchinson, I. H., Principles of Plasma Diagnostics, 2nd edition, (Cambridge University Press, 2002)
2. Lieberman, M. A. and Lichtenberg, A. J., Principles of Plasma Discharges and Materials Processing (John Wiley, New York, 1994)
3. Huddlestone R. H. and Leonard S. L., Plasma Diagnostic Techniques (Academic Press, Cambridge, 1965)
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