An Open Atmospheric Inductively Coupled Plasma

[ ICP torch ]

One of the first applications of PLASIMO was the modeling of an atmospheric argon ICP. ICP stands for Inductively Coupled Plasma and indicates that the power is coupled into the plasma by means of electro-magnetic induction. The plasma, which has a diffuse annular shape, can be seen as the secondary winding of a transformer, a load coil acts as the primary circuit: its two windings can be clearly observed in the figure.

The plasma is used primarily in spectro-chemical studies. A small amount of an analyte is fed into the argon feed gas which enters the quartz tube from the bottom side. The nature of this analyte can be studied by looking at the change in the emitted spectrum.

The plasma is operated in open air (at atmospheric pressure) and has a typical input power of one kilowatt. The gas temperature in the plasma region is typically between five and ten thousand Kelvin. The electron temperature is higher, perhaps 20 percent: this is a so-called two-temperature plasma. The electron density has a maximum of typically 1022m-3.

Further reading:

  1. D. A. Benoy. Modelling of Thermal Argon Plasmas. PhD thesis, Eindhoven University of Technology, The Netherlands, 1993. [ bib | .pdf ]
  2. J. J. A. M. van der Mullen and J. Jonkers. Fundamental comparison between non-equilibrium aspects of ICP and MIP discharges. (1999) Spectrochimica Acta. Part B : Atomic Spectroscopy, 54(7), 1017-1044 [ bib | http ]

Related experimental works from EPG:

  1. M. J. van de Sande, P. van Eck, A. Sola, and J. J. A. M. van der Mullen. The relation between internal and external parameters of a spectrochemical inductively coupled plasma. (2002) Spectrochim. Acta , B57:829 [ bib | http ]
  2. J.M. de Regt, R.D. Tas, J.A.M. van der Mullen, and D.C. Schram. (1996) A diode laser absorption study on a 100 mhz argon icp. J. Phys. D: Appl. Phys., 29, 2404-2412 [ bib | http ]
  3. J.M. de Regt, R.D. Tas, J.A.M. van der Mullen, and D.C. Schram. (1996) A closed inductively coupled plasma for lighting purposes mapped by spectroscopical techniques. J. Phys. D: Appl. Phys. , 29, 1489-1499 [ bib | http ]
  4. F.H.A.G. Fey, W.W. Stoffels, J.A.M. van der Mullen, B. van der Sijde, and D.C. Schram. (1991) Spectrochim. Acta , 46B, 885 [ bib ] http ]