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Pulse optimization criteria for the microcavity hollow cathode discharge emission source

Content Provider	Royal Society of Chemistry (RSC)
Author	Williams, J. C. Mixon, Paul D. Griffin, Steven T. Cai, Xiangjun J.
Copyright Year	1994
Abstract	Criteria are presented that are important for optimizing the emission intensity in a microcavity hollow cathode (MCHC) discharge source operated in the pulsed mode. The d.c. component must be sufficiently large to ensure a continuous discharge inside the HC. It is shown that the pulse parameters that result in maximum light output for the spectral lines of the cathode material do not result in maximum light output from sodium as an analytical sample which has been mounted inside the HC. This lack of correlation may be due to either the physical and chemical properties of the species or to the manner in which the species enters the HC discharge plasma. Voltage–current characteristics are presented for the MCHC to illustrate the role of the d.c. component during pulsed mode operation. The d.c. current of the discharge must be >5 mA in order to maintain a discharge in the HC. At currents <5 mA for this system the discharge is restricted to the planar surface of the cathode and will not participate in the excitation of analytes thrown into the hollow space during the pulse.
Starting Page	697
Ending Page	700
Page Count	4
File Format	PDF
ISSN	02679477
Volume Number	9
Issue Number	6
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9940900697
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	MCHC Emission intensity Cathode Blood plasma
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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Pulse optimization criteria for the microcavity hollow cathode discharge emission source

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