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Issue 1, 2010
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A three phase rotating field microwave plasma design for a low-flow helium plasma generation

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Abstract

A new 2.45 GHz frequency powered helium plasma source with rotating microwave field generated within the three electrodes has been developed. A stable symmetrical low-flow helium discharge is formed at atmospheric pressure with a minimum field strength at the axis. Thus, a triangle shaped ring plasma is obtained with a channel at the center through which the sample is introduced using a laminar dual-flow injector. The helium plasma operates at a microwave input power of 30–150 W and total gas flow of 200–1500 ml min−1 and it is self-igniting. The preliminary investigation of the plasma fundamental parameters provides a He excitation temperature up to 4000 K, rotational temperature (OH) up to 3100 K and electron number density up to 7.5 × 1014 cm−3. To demonstrate the plasma robustness, both the tolerance for water loading and the excitation and ionisation capability for hydride-forming elements as well as for ionic chlorine are presented. The detection limits for As, Sb and Hg obtained by continuous hydride generation without hydrogen separation were 12, 10 and 9 ng ml−1, respectively.

Graphical abstract: A three phase rotating field microwave plasma design for a low-flow helium plasma generation

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Article information


Submitted
04 Mar 2009
Accepted
22 Sep 2009
First published
14 Oct 2009

J. Anal. At. Spectrom., 2010,25, 44-47
Article type
Paper

A three phase rotating field microwave plasma design for a low-flow helium plasma generation

K. Jankowski, A. P. Ramsza, E. Reszke and M. Strzelec, J. Anal. At. Spectrom., 2010, 25, 44
DOI: 10.1039/B904428K

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