VEVOF - Experiments with vibrationally excited hydrogen molecules

Within our fusion related program we are performing experiments with vibrationally excited H2 and D2 molecules. For this purpose specific vibrational spectrometer has been built. Its operation is based on the properties of dissociative electron attachment of low energy electrons (0-5 eV) in hydrogen. Magnetic field is used in this spectrometer for guiding electron beam and for extracting and separating H- and D- from heavier ions and electrons. Original ion extraction system based on penetrating electric field was constructed for focusing and detection of low energy ions. An electrostatic version of such vibrational spectrometer that was earlier developed at Université Pierre et Marie Curie, Paris is also available in the laboratory through a contract with CNRS, France.

VEVOF experimental equipement

Performed are the studies of vibrational population of molecules created by:

  • Atom recombination on metal surfaces exposed to the partially dissociated neutral atmosphere,
  • Recombination at Pd membrane after hydrogen permeation,
  • Effusion from hot tungsten capillary and
  • Thermal desorption.

New data are acquired on DEA in H2 and D2.

Source of vibrationally hot H2 and D2 has been constructed for spectroscopic studies in hydrogen plasma.

Contact person:

Dr. Iztok Čadež

Last updated: 01/22/2014