INFLUENCE OF ISOTOPIC EFFECT ON THE SHIFT OF THE IONIZATION-POTENTIALS OF HYDROGEN DESORBED FROM THE METAL HYDRIDE SURFACE

The sets of vertical ionization potentials for molecules of hydrogen ( deuterium) desorbed from metal hydrides as well as for thermodynamical ly equilibrated molecular hydrogen (deuterium) at room temperature wer e obtained by means of the ionization efficiency curves method using m ass-spectrometry measurements. Some sets of term differences are expla ined by thermoemission vibrational excitation of molecules. Comparativ e analysis to the data previously obtained is given. It was establishe d that the anomalies of electrical transfer observed in the gas phase of metal-hydride-hydrogen systems are caused by vibrational excitation of H-2-molecules, generated during recombination of H-atoms on the me tal hydride sorbent surface. Copyright (C) 1996 International Associat ion for Hydrogen Energy.