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Identification of Limiting Noise Sources in the Microwave-Induced Nitrogen Discharge at Atmospheric Pressure

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Abstract:

The noise from the emission signal of the microwave-induced nitrogen discharge at atmospheric pressure (MINDAP) has been analyzed. Wavelength-scan flicker-ratio, precision measurements, time-trace correlation and noise amplitude spectra were used to determine the individual components of the system noise. Noise spectra are reported with the use of a nebulizer sample introduction system for desolvated and undesolvated aerosol, for varying analyte concentration, and for background emission from nitrogen and water vapor. The analytical system appears to be flicker-noise-limited below about 1 Hz for all measurements made. Only 60 and 120 Hz peaks are detected in the frequency region extending to 700 Hz, and presumably arise from the microwave power supply

Keywords: Emission spectroscopy; Instrumentation, emission spectroscopy; Instrumentation, microwave plasma; Techniques, spectroscopic

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702854249105

Affiliations: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: January 1, 1985

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