are contained.
Meanwhile, CuO could not be detected in Figures 7 and 8.
Figure 12 shows XANES spectra for mixed standard
samples of Cu2S and CuO. It was found that the peaks of
derivatives of absorption corresponding to 8989eV photon
energy was appeared, when the weight ratio of Cu2S / CuO
mixed standard samples was range less than 2/1. It is
thought that CuO cannot be detected in the case of the
weight ratio more than 2/1. As a result, it seems that CuO