Discharge products were studied with the use of an infrared spectrometer in a cylindrical discharge tube. The results obtained are as follows.
The main constituents of the gases produced by a discharge in air are N
2O, NO
2, HNO
3, and O
3. Among them, N
2O is stable and its concentration does not decrease for a long period of time after the discharge. On the other hand, HNO
3 and NO
2 are unstable and decompose immediately after the discharge. Both HNO
3 and NO
2 are produced periodically at a humidity higher than 3×10
16/cm
3 in air. In particular, the concentration of NO
2 increases suddenly when HNO
3 decomposes. At low pressures, a small amount of O
3 is generated, whose concentration increases with increasing pressure. On the contrary, HNO
3 does not exhibit a periodic generation and its concentration is low at high pressures.
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