Application of linear density response theory to electron-impact autoionizing resonances

Autoionizing resonances in time-dependent density functional theory.

Autoionizing resonances that arise from the interaction of a bound single-excitation with the continuum can be accurately captured with the presently used approximations in time-dependent density functional theory (TDDFT), but those arising from a bound double excitation cannot. In the former case, we explain how an adiabatic kernel, which has no frequency-dependence, can yet generate the stron...

Density-functional theory with optimized effective potential and self-interaction correction for ground states and autoionizing resonances

We present a self-interaction-free density-functional theory ~DFT! for the treatment of both the static properties of the ground states and the photoionization processes of many-electron systems. The method is based on the Krieger-Li-Iafrate ~KLI! treatment of the optimized effective potential ~OEP! theory and the incorporation of an explicit self-interaction correction ~SIC! term. Such an exte...

Resonances in electron-impact electron detachment of C2-.

Molecular R-matrix with pseudostate calculations are reported for the electron-impact ionization cross section of the carbon dimer anion. A (1)Sigma_(g)(+) resonance is found near the detachment threshold and two further resonances, of (3)Pi_(g) and (1)Pi_(g) symmetry, are found near 10 eV close to the structures observed experimentally. These unusual shape resonances are a result of the compet...

Linear-response theory of Coulomb drag in coupled electron systems.

Nuclear Giant Resonances and Linear Response

We search for nonlinear effects in nuclear giant resonances (GRs), in particular the isovector dipole and the isoscalar quadrupole modes. To that end, we employ a spectral analysis of time-dependent Hartree-Fock (TDHF) dynamics using Skyrme forces. Based on TDHF calculations over a wide range of excitation amplitudes, we explore the collectivity and degree of harmonic motion in these modes. Bot...