Electron density and collision frequency studies using a resonant microwave cavity as a probe Page: 2
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Freeman, Ronald H., Electron Density and Collision Frequency
Studies Using a Resonant Microwave Cavity as a Probe, Doctor
of Philosophy (Physics), May, 1973, 258 pp.,14 tables, biblio-
graphy, 103 titles.
Electron densities and collision frequencies were obtained
on a number of gases in a dc discharge at low pressures (0.70-2mm
of Hg). These measurements were performed by microwave probing
of a filament of the dc discharge placed coaxially in a resonant
cavity operating in a TM010 mode. The equipment and techniques
for making the microwave measurements employing the resonant
cavity are described. One of the main features of this investigation
is the technique of differentiating the resonance signal of the
loaded cavity in order to make accurate measurements of the resonant
frequency and half-power point frequencies.
Measurements in the positive column of the dc discharge for
a number of gases (argon, helium, carbon monoxide, deuterium,
hydrogen, nitrogen, oxygen, carbon dioxide, nitrous oxide, and
gas mixtures) were found to display the following results:
Electron densities increased with increasing discharge current and
with increasing gas pressure in the pressure range measured (0.7 to
2.0 mm of Hg). Electron collision frequencies were found to be
nearly independent of discharge current for some gases probed at
the high end (above 1000p) of the measured pressure range. Several
anomalous effects, including negative frequency shifts and
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Freeman, Ronald Harold. Electron density and collision frequency studies using a resonant microwave cavity as a probe, dissertation, May 1973; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc699492/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .