Fine Structure of the L₂₃ Absorption Edge of Magnesium Metal

Abstract

IN the region of ordinary X-rays, variations in the intensity of radiation transmitted through a metal foil on the short wave-length side of an absorption edge have led to interesting results in relation to the zone-structure of the unoccupied electron levels of a metal. The extension of such fine structure measuiements to absorption edges which lie in the region of ultra-soft X-rays (say 100–300 A.) allows the possibility of a considerable increase in the resolving power of the method, since in this region the breadth of the underlying K, Llevels is known to be only of the order of 1/4 volt.