Time-integrated emission spectra from the pulsed discharge of a 3.5-MeV electron beam, with 90-kA peak current of about 30-nsec duration, and guided by a glass rod protruding from the cathode in a field-emitting diode, have been studied with a quartz-prism spectrograph. With anodes of graphite or polyethylene, the spectrum in the near-uv to visible range is found to consist mainly of emission lines from C, C+, C++, and C+3, and similar ones from silicon. The spatial dependence of emission intensity indicates that a hot spot is present during the discharge near the anode surface. The temperature and the electron density in the plasma are estimated through a theoretical analysis of the composition of carbon in the gas phase.
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Wei et al. (1974) studied this question.
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