KX-Ray Absorption Spectra of Germanium in Crystalline and in Amorphous GeO2

The Ge $K$ x-ray absorption spectrum was measured in three forms of Ge${\mathrm{O}}_2$: hexagonal crystalline, tetragonal crystalline, and amorphous. From the measured results it is concluded that either the Kronig explanation of the extended fine structure observed in the spectra needs to be modified or the "glassy" Ge${\mathrm{O}}_2$ is actually crystalline in character over small regions, i.e., the amorphous Ge${\mathrm{O}}_2$ has a high degree of shortrange order identical to that of the hexagonal crystalline form.