Complex Cyclotron Resonance in Dilute Gases

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Abstract
An X‐band electron spin resonance spectrometer has been used to analyze the products of an electrodeless discharge in flowing gases at low pressure. During a search for polyatomic free radical fragments, a multiple signal was found near g=2.0000. Three poorly resolved peaks were found for a variety of paraffins and olefins, while methane, ammonia, methylamine, and sulfur dioxide yielded doublets. The structure was best resolved at low pressure. The spacing of the peaks increased with ESR microwave power. Evidence is presented that the signal is caused by cyclotron resonance of photo‐ionized electrons. It is suggested that this multiple resonance is more apparent than real, and arises from either a velocity‐dependent capture process or from dephasing of electrons upon collision with gas molecules.

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