Orientation effects in elastic scattering of polarized X-rays by linear molecules

Strong orientation effect is discovered theoretically upon the change of the scheme of suggested experiment on anomalous elastic x-ray scattering of linearly polarized x-ray radiation by linear diatomics near the ionization thresholds of inner molecular orbitals. Studied are the effects on the shape of theoretical scattering spectra of additional excitations/ionizations of outer-shell electrons. Within the one-centre approximation for the molecular orbitals wavefunctions the analytical structure of the linear molecule's formfactor is obtained. The dipole transition matrix elements and photoabsorption cross sections are calculated by the methods of the theory of non-orthogonal orbitals.