Abstract
The rf spectrum of a gaseous discharge in a strong magnetic field is measured with the aid of a fixed frequency receiver by sweeping the magnetic field by approximately two percent. Source of radiation and receiving equipment are described. The following results were obtained: (1) A series of emission lines around the cyclotron frequency. (2) An emission at a frequency which increases with increasing magnetic field strength and decreases with increasing external voltage. (3) A strong resonance when both frequencies coincide: the intensity increases by a factor of 100 and more. The frequency spectrum is discussed in terms of a simple theory, which accounts for local space-charge fields. Their spatial distribution is inferred from the frequency behavior of the emission lines. Finally, a mechanism is suggested which classifies the resonance effect as an energy transfer from a longitudinal plasma mode into e.m. radiation.
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