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Report No.

Electronic states of alkali metal amide and alkaline earth metal amide

Kamakura, Nozomu; Yamagami, Hiroshi; Takeda, Yukiharu   ; Okane, Tetsuo  ; Saito, Yuji  ; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kinoshita, Toyohiko*

In this research, the electronic states of the insulator alkali metal amide ($$mathrm{KNH_2}$$, $$mathrm{NaNH_2}$$) and alkaline earth metal amide ($$mathrm{Ca(NH_{2})_{2}}$$), which are lightweight complex hydrides being considered as a high-capacity hydrogen storage material, are investigated by the soft X-ray emission (XES)and absorption spectroscopies. The sharp three peak structure commonly observed in the XES spectrum of alkali metal amides shows the localized character of the valence electrons, while the importance of the number of the amide ion is shown by the XES spectrum of $$mathrm{Ca(NH_{2})_{2}}$$ which is clearly different from that of alkali metal amide. The comparison with the band calculation clarifies the electronic sates of $$mathrm{Ca(NH_{2})_{2}}$$.



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