Authors: Hsu, Wu-Hwa¹; Majidi, Vahid²; Coleman, David M.²

Source: Applied Spectroscopy, Volume 41, Issue 5, Pages 715-921 (July 1987) , pp. 739-748(10)

Publisher: Society for Applied Spectroscopy

Abstract:

We report the first application of time- and spatially resolved "hook" spectroscopy to quantitatively determine the number density of species sampled by an atmospheric-pressure analytical spark discharge. The new instrument consists of a tunable dye laser light source, a Mach-Zehnder interferometer, a stigmatic spectrograph, and a high-fidelity image transfer system. The integrated number densities of ground-state sodium atoms, ablated from a graphite electrode containing NaCl, are deduced from the corrresponding hook spectrum. Data are obtained at different spatial windows with respect to the interelectrode axis and also at different times after the spark breakdown. Advantages and limitations of the approach are discussed.

Keywords: Atomic emission spectroscopy; Number density measurements; Anomalous dispersion; Hook spectroscopy

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702874448292

Affiliations: 1: Department of Chemistry, Wayne State University, Detroit, Michigan 48202; present address: Department of Chemistry, Indiana University, Bloomington, IN 47401 2: Department of Chemistry, Wayne State University, Detroit, Michigan 48202

Publication date: 1987-07-01

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