Electronic Structure of the YH3 Phase from Angle-Resolved Photoemission   Spectroscopy
  Yttrium can be loaded with hydrogen up to high concentrations causing dramatic structural and electronic changes of the host lattice. We report on angle-resolved photoemission experiments of the Y trihydride phase. Most importantly, we find the absence of metal d-bands at the Fermi level and a set of flat, H-induced bands located at much higher binding energy than predicted, indicating an increased electron affinity at H sites. 
J. Hayoz, C. Koitzsch, M. Bovet, D. Naumovic, L. Schlapbach, P. Aebi