||Characterization of polycrystalline tungsten surfaces irradiated with nitrogen ions by X-ray photoelectron spectroscopy
Kamiura, Y. ,
Umezawa, K. ,
Teraoka, Y.Yoshigoe, A.
1614 , 2017-02 , 公益社団法人日本金属学会
olycrystalline tungsten surfaces were irradiated at room temperature with two kinds of nitrogen ions N+ and N2+̶ at 2.5 keV by using an ion beam apparatus. Results of X-ray photoelectron spectroscopy (XPS) experiments performed using synchrotron radiation at SPring-8 showed that upon irradiation of the tungsten sample with either kind of ion, the full widths at half maximum (FWHM) of the W 4f7/2 and W 4f5/2 peaks broadened and the peaks at 35.8 eV and 37.8 eV which correspond to WO3 binding energies increased slightly; this indicated the formation of tungsten nitride at the subsurface below the interface.