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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 43,
  • Issue 6,
  • pp. 1093-1095
  • (1989)

Modification of an ICP Impedance-Matching Network for Center-Grounded Load-Coil Operation

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Abstract

The development of a center-grounded load coil in inductively coupled plasma-mass spectrometry (ICP-MS) has been reported to reduce greatly the so-called "secondary discharge" between the plasma and mass-spectrometer interface. Presumably, this secondary discharge results from a high floating ac potential in the plasma relative to the sampler or skimmer and can complicate attempts to optimize or characterize the ICP-MS instrument. With the center-grounded load-coil configuration, each half of the load coil attempts to couple into the plasma a potential of opposite polarity; however, because of the relatively high conductivity of the discharge, the net voltage remains near zero. Although several workers have explored alternative load-coil geometries in an effort to achieve the same ends, the center-grounded load-coil configuration is simple and effective.

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