HIGHLY RESOLVED X-RAY STRUCTURES AND THE ELECTRONIC STRUCTURES OF TANTALUM AND TUNGSTEN
Günter Böhm, K.A. Ulmer · Le Journal de Physique Colloques · 1971
Investigating the structure of the short wavelength limit of the continuous X-ray spectrum in the ultrasoft X-ray region provides information about the density of electron states in the unoccupied regions of the energy bands of solids. With synthetic self-grown and spherically bent dioctadecyladipate crystals (2 d = 93,8 Å) as dispersing devices the continuous X-ray spectra of Tantalum and Tungsten were measured. Fine structures near the short wavelength limit of about 80 Å are discussed. Measured X-ray isochromats of the same energy region are compared with the course of the theoretical densities of states above the Fermi edge and rigid band considerations for Tantalum and Tungsten, resulting in qualitative agreement.