Double discontinuities of wide separation in the x-ray absorption spectra of transition elements in highly oxidized compounds

The paper consists of two parts. (1) The author studied the mechanism of the appearance of the double discontinuities of wide separation in the X-ray L1 absorption spectrum of Mo in MoO3, which were found in the recent research about the effects of chemical combination on various X-ray absorption limits, and that of Nb in Nb205. Then he arrived at the conclusion that the discontinuity of the higher energy corresponds to the electronic transition from L1 to 5p, and that of the lower energy is attributed to that from L1 to the 4d,5s state. (2) The author applied the explanation to the double discontinuities which have been observed by many researchers in the K absorption spectra of 3d transition elements in highly oxidized compounds, and showed that these double absorption discontinuities are ascribed to the electronic transitions K - 4p and K - 3d,4s. (author)