Natural linewidths of Cu Kα1,2 spectra obtained with an antiparallel double-crystal X-ray spectrometer

Abstract

To investigate the natural linewidths of Cu Kα_1,2 diagram lines, the spectra of these lines were recorded in detail using an anti-parallel double-crystal X-ray spectrometer. The values obtained for the measured Cu Kα₁ and Kα₂ natural linewidths are 2.264(18) eV and 2.534(73) eV, respectively. The contribution of the Coster–Kronig (CK) transition for the Kα₂ linewidth is found to be approximately 0.27 eV. Theoretical values 2.1454 eV for the Kα₁ line and 2.1292 eV for the Kα₂ line were calculated, using the GRASP and FAC codes. A detailed study of the same spectra using Si and Ge crystals and several Bragg surfaces was performed. In addition, the spectral measurements of Cu Kα_3,4 satellite lines were made, and information on the energy values, FWHMs, and intensity ratios of these satellite lines was obtained from multiple-peak fitting analyses.