[en] The inelastic collision X + Y → A + D → A + B + C, in which X, Y, A, B, C, D are any atomic particles, is considered. It is supposed that all particles have electric charges and their Coulomb interaction is investigated when the velocity Vsub(AB) is small. It is demonstrated that the problem has an exact analytical solution. The specific example of the near-threshold excitation of the autoionised state (3s^-1 4p) ¹P in Ar by electron impact is considered. (author)

[en] A post-collision interaction (PCI) in the cascade Auger processes is considered. The general analytical formulae for an amplitude and a cross section of the process under consideration are obtained. These formulae allow for the PCI distortion and are valid for a wide range of velocities of the emitted electrons except a near-threshold region. A structure on the photoelectron line profile is revealed for some kinematics of the reaction. This structure is associated with the electrons interaction following the cascade Auger decay, rather than an interference between the amplitudes for the resonance and non-resonance processes. (author)

[en] The influence of inner shells upon the anisotropy parameter of the 4p-photoelectrons angular distribution in Kr is investigated in the frame of the random phase approximation with exchange (RPAE). The comparision with experimental data and other calculations demonstrates an essential role of intershell correlations, the account of which allows to achieve a satisfactory agreement between theoretical and experimental data. (orig.)

[en] The electron or ion impact excitation of the giant resonances is considered. The spectrum of ejected electrons is shown to be strongly distorted by post-collision interaction (PCI). (author)

No abstract available

[en] The ion-atom inelastic scattering processes including (i) excitation of autoionization states of atoms by ion impact, and (ii) ionization of inner atomic shells are considered. The Coulomb interaction of particles in the final state of such resonance processes (the post-collision interaction - PCI) exerts a strong influence on the energy and angular distributions of the particles. The theoretical models of PCI and experiments that make it possible to observe the PCI effects in different kinematic regions are discussed in this survey. The characteristics of PCI are considered by comparing photon and electron impact processes. Coincidence and noncoincidence experiments as well as the dependence of the lineshift on the incoming ion energy are discussed. The PCI effects are considered also in the kinematic region, where the relative velocity of a scattered ion and an autoionization electron is close to zero. In this case PCI results in the so-called Coulomb focusing of the autoionizing electrons and the oscillatory structure of the cross section. The interference between the direct and resonance scattering processes is considered, and possibilities of its experimental observation are discussed. (orig.)

[en] Many-body diagram techniques are used to analyze the excitation of the ³S triplet atomic state by low- and moderate-energy electrons. The calculations are taken to first or second order with respect to the electron--atom interaction potential, and the distortion of the electrons in the initial, final, and intermediate states by the atomic field is treated using the Hartree--Fock self-consistent field method. The energy-angle differential cross section is calculated explicitly for excitation of the helium 2³S level by electrons of energy from 30 to 250 eV. The results are compared with experimental data and other calculations, and the importance of the second-order corrections and the distorting influence of the atomic field on an incoming electron are pointed out

No abstract available

[en] The correlation function between two emitted electrons has been calculated as a function of their momentum difference for double ionization of 1s2s excited He atoms by fast ion impact. A simple quantum mechanical approach is developed to take into account the dynamics of two-electron ejection as well as the effects of electron exchange and correlated electron motion in the final state. A clear difference between the correlation functions of the excited and ground state targets is reported. (author)

[en] We study electron-electron correlation effects in double ionization of He and Ne by 3.6 MeV/amu Au⁵³⁺ impact by analysing the correlation function for back-to-back emission of electrons with equal energy. For this particular emission pattern we find the correlation function to be sensitive to the target while without selection of this pattern no significant dependence on the initial state is observed. Therefore, this method may open the possibility to sensitively map correlated many-electron bound states. (author)