Atomic emission and laser excited atomic fluorescence studies of the glow discharge for the analysis of microsamples
The glow discharge as an atomizer for atomic spectroscopy offers excellent advantages that have not been fully exploited. In this work fundamental studies about the sputtering process of liquid microsamples was investigated. This work was done by two different approaches: Atomic Emission Spectroscopy using a wavelength modulation technique for simultaneous background correction, and Laser Excited Atomic Fluorescence Spectroscopy. In the first approach, the sample holder was a cooled cooper hollow electrode. The hollow depth as well as the atomizer operating parameters -- current, voltage, and pressure -- were optimized in order to follow the temporal behavior of the analyte. In the second approach, the sample holder was a hot planar copper electrode. Here, the atomic excitation process was produced by a copper vapor pumped dye laser at a repetition rate of 6,000 Hz, and the fluorescence signal was collected at 90 degrees from the laser path. In the atomic fluorescence studies a comparison of the pulsed and non-pulsed operating modes of the glow discharge was carried out. Also, information about the vertical atomic distribution in the chamber area was obtained. Calibration curves and figures of merit for lead and gallium using the atomic emission system and lead using the atomic fluorescence system were determined. The effect of sodium chloride as a matrix interferant was investigated using both techniques. The results of these studies using the two approaches along with brief discussions about their theoretical aspects are presented in this dissertation.
- Research Organization:
- Florida Univ., Gainesville, FL (United States)
- OSTI ID:
- 7236040
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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