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In order to obtain detailed information on the excitation process which takes place in a spark discharge (SD) plasma, a two dimensional image of atomic emission was observed by using an imaging spectrograph equipped with a charge-couple device (CCD) detector. The emission image of copper emission (Cu I 324.75 nm) emitted from a SD plasma region induced in argon at a low pressure has been successfully observed. It indicates that the copper emission is the most intense at plasma zones being 1.5–2.0-mm apart from the sample surface and becomes weaker at larger distance from the central zone of the SD plasma region, and that the emission image changes with time; where the optimal condition of the emission image is obtained at a delay time of 40 μs. These results could be valuable information in order to have better understanding about the complicated spectrochemical phenomena occurring in the SD plasma.

Observation of Atomic Emission Image from Spark Discharge Plasma by Using Two-dimensional Spectrograph