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The effect of the presence of molecular hydrogen on plasma recombination is considered at temperatures of a few electron volts. The role of 2-body processes such as ion conversion and dissociative attachment in accelerating the recombination is exposed, both in a simplified model, which can be solved analytically, and in more realistic numerical calculations. All the important atomic and molecular processes are included in a set of non-linear rate equations, from which the important parameters of the model are identified showing which cross sections are critical.

It is possible to extend the model to mimic recycling at the plasma edge. This enables the importance of the contribution of H(2) to recombination to be demonstrated. Some of the ideas basic to atomic modelling of plasmas may have to be revised if molecular processes are important in the plasma dynamics. The non-linearities lead to instabilities, which allow the co-existence of several solutions for the same physical parameters. .

Additional information

Authors: GREENLAND P T, Imperial College, Blackett Laboratory, London (GB);REITER D, Forschungszentrum, Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Report: Berichte des Forschungszentrums Jülich 3258 EN (1996) 46pp.
Availability: Available from Forschungszentrum Jülich GmbH, Zentralbibliothek, 52425 Jülich (DE)
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