Electronic structure of the monoclinic and hexagonal trioxides of tungstenand hexagonal hydrogen tungsten bronze H0.24WO3

The methods of x-ray photoelectron spectroscopy (XPS) and x-ray emission sp ectroscopy (XES) were used to study the electronic structure of the monocli nic and hexagonal modifications of WO3, as well as hexagonal hydrogen tungs ten bronze H0.24WO3. The OK alpha emission bands and the XPS spectra of the valence and core electrons were obtained for all of the compounds. It is s hown that the half-width of the OKa bands and the XPS spectra of the valenc e electrons increase in the modification sequence WO3 --> hexagonal WO3 --> H0.24WO3 The near-Fermi region of the XPS valence-electron spectrum of the compound H0.24WO3 was found to contain art additional subband that is abse nt from both modifications of WO3. It was established that, within the expe rimental error, the binding energies of the W4f and O1s core electrons rema in constant for all of the compounds that were studied.