Abstract
The spontaneous emission from hollow-cathode discharges in flowing nitrogen is investigated spectroscopically. The vibrational energy distributions in the C3Πu state of N2 and the B 2Σu+ state of N2+ are studied as a function of discharge current, magnetic-field strength, and gas flow. The rotational energy distributions in these electronic states of N2 have also been determined. The effective rotational and vibrational excitation temperatures are found to be low, TR≈2000°K and TV≈10 000°K respectively. The electronic excitation of N+, the dominant emitting atomic species, is found to correspond to much higher temperatures, Texc=35 000°K.
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