Real-space, multiple-scattering-theory method for the calculation of x-ray bremsstrahlung isochromat spectra

We introduce a new method for the calculation of the x-ray bremsstrahlung isochromat spectra. The method is worked out within a real-space multiple-scattering theory and disposes of the conceptual and practical difficulties inherent in the band-structure calculations. Our concept makes possible to calculate spectra in both near and extended energy regions even for systems lacking translational symmetry. The method is illustrated through a calculation of four isochromat spectra of Cu and Pd. For the first time the extended x-ray-isochromat fine structure is calculated.