Soft X-ray appearance potential spectrometer has been constructed for surface studies. The powder sample was put into a cage-type holder consisting of the stainless steel mesh. The resolution and sensitivity of the spectrometer were tested experimentally.
The appearance potential spectra were obtained for V, VCl
3, VOCl
2 V
2O
2, Ni, NiO and Ni
2O
3. As regards vanadium compound, the shift of V-
L3 binding energy of VCl
3 and V
2O
5 were 1.2 eV and 1.6 eV, respectively. On the other hand, the energy shift of VOCl
2 has hardly been observed. In the case of nickel oxides, NiO and Ni
2O
3 produce the shift of 0.4 eV and 0.5 eV, respectively. It is a characteristic that the smaller the atomic number is, the larger the shift value of binding energy of
L3-level becomes.
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