Fig. 2: Chemical state and coordination environment of titanium hydride.

a High-resolution HAADF-STEM image of titanium hydride. b Integrated pixel intensities in the selected regions of (a). c Atomic-resolution HAADF-STEM image of titanium hydride. d XAFS spectra and (e) FT-EXAFS spectra at Ti K-edge. f Ti K-edge EXAFS (line) and curve fit (points) for TiH1.97 in R-space. g The fit curve of k3χ(k) oscillation functions in k-space for TiH1.97. h, i WT-EXAFS of Ti for TiH1.97 and Ti foil.