A New Type of X-Ray Scattering

Abstract

INSULATORS are characterized by discrete allowed and forbidden zones having sufficient energy width. In diamond, theoretical calculation by Kimball¹ shows that the forbidden zone width is about 7 eV., which has been experimentally verified by the appearance of the ultra-violet absorption band² at 1700 A., that is, 7 eV. I have determined the forbidden zone widths in the case of the insulators aluminium oxide and silica from their soft X-ray absorption and valence emission spectra³. Skinner⁴ has investigated beryllium, carbon and boron in the conducting state, as well as in the insulators beryllium oxide (BeO), diamond and boron trioxide⁵. Siegbahn⁶ has investigated K_a of diamond, as well as that of graphite, the conducting variety. E. Guinner and H. Kiessig⁷ have investigated K_a, that is, K valence band spectra of boron in the pure element, in various binary alloys and in boron trioxide, which is a typical insulator. I have investigated K valence band spectra of the insulators aluminium oxide and silica.