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It is not always realized that the gaseous atmospheres surrounding a discharge used for spectrochemical analysis may be the principal constituent of that analysis. The usual gaseous atmosphere is air at atmospheric pressure, but several variations are possible. The air may be replaced by either monatomic or molecular gases. The pressure may be varied and the flow pattern around the discharge may be changed. Often the flow is simply left to convection. It is also possible to blow the gaseous atmosphere at, or around, the gap in some manner.
Laboratory Supervisor, Applied Research Laboratories, Inc., Glendale, Calif
Development Division Manager, Applied Research Laboratories, Inc., Glendale, Calif