Abstract
Neutral hydrogen molecule is an important constituent of edge plasma in tokamak reactors. These molecules are continuously produced by ion neutralisation and recombination on plasma walls and are subsequently reemitted in the plasma. We initiated an experimental program to study processes in which vibrationally excited hydrogen molecules are involved. Two specific experimental techniques have been developed, one for vibrational spectroscopy of hydrogen molecules (H2 and D2) and another one for H and D depth profiling in materials. New information has been acquired on hydrogen recombination on tungsten and also on dissociative electron attachment in hydrogen, both relevant to edge plasma. Experimental setups are shortly presented as well as some of the results on above processes.
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