Periodic generation of discharge products were studied with the use of an infrared spectrometer in a cylindrical discharge tube. The results are as follows.
Among the constituents of gaseous products by discharge in air, the generation and extinction of both HNO
3 and NO
2 were repeated periodically with the same period as that of the discharge current in spite of the constant applied voltage.
The periodic characteristics were found to be a function of discharge current, but it was not the dominant cause of the periodic characteristics. The decomposition of HNO
3 were not found to depend on NO
2 but to depend on NO. It is suggested that the existence of a certain minimum amount of NO in the discharge appears to be an important factor in determining the periodic characteristics.
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