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Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
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TITLE |
Maintenance of Helium Microwave-Induced
Plasmas at Powers of Greater than a Kilowatt for Chemical Analysis [PDF] |
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AUTHORS |
K. Cull
and J. Carnahan 1989 24 3 150-158 |
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Abstract A description of a helium kilowatt-plus microwave-induced plasma (KiP-MIP) system is presented. The output of a 2450 MHz
system, with root mean square powers of up to 2.7 kW, are directed to a
plasma torch within a TM010 resonator. The system is utilized to
maintain plasmas of argon, nitrogen and helium; the latter showing unique
potential for chemical analysis. Power waveforms and their effects on the
plasmas are illustrated with “unfiltered” and “filtered” systems. Reflected
and forward power are observed as the magnitude of
the applied power is varied and the slide tuner is adjusted. Preliminary
spectra from aqueous chloride and bromide are presented. Key Words: Helium plasma, Microwave-induced plasma, Atomic emission spectrometry, High power helium plasma, Helium Discharges, Non-metal atomic spectrometry. |
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