Multiple ionization upon K-shell photoabsorption of the CO and N2 molecules.

The spectra of multiple ionization of CO and N2 in the gas phase in the region of the K-shell ionization thresholds of C and N are studied theoretically. The processes of additional excitation/ionization from 1pi and 5sigma-shells are included. The effects of many-electron correlations on the extention of multiplet structure for some configurations of multiple excitations is studied.

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.