Darmstadt 2008 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 9: Diagnostische Methoden
P 9.3: Vortrag
Donnerstag, 13. März 2008, 09:00–09:15, 2D
Rovibrationally-Excited H2/HD/D2 Molecules Produced in Hydrogen-Deuterium Plasmas Detected by LIF in the VUV — •Onno Gabriel, Jeroen van den Dungen, Daan Schram, and Richard Engeln — Department of Applied Physics, Plasma & Materials Processing, Eindhoven University of Technology, Postbus 513, 5600 MB Eindhoven, The Netherlands
Hydrogen molecules play an important role in fusion experiments as well as in other fields such as astronomy. When driven with mixtures of H2 and D2, excited H2/HD/D2 molecules are produced in the cooler regions of experimental fusion reactors, e.g. on the divertor surface. In interstellar media, where H2 and HD are respectively the most and third most abundant molecules, much can be learned about cooling mechanisms of clouds and the star formation processes. Of special interest is the internal excitation of hydrogen molecules in the electronic ground state (X1Σg+), which can take energy values up to 4.5 eV and influences strongly hydrogen collision processes. We measure these rovibrationally-excited H2/HD/D2 molecules produced in a hydrogen-deuterium plasma jet by laser induced fluorescence in the VUV (Lyman transitions). High rovibrationally excited hydrogen molecules were found, resulting from Lyman transitions. The distributions of internal energies are the result of molecule formation processes, taking place in the plasma gas phase as well at surfaces in contact with it.