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The inter-Coulombic decay (ICD) process, where one electronically-excited species relaxes, while the neighboring one is concomitantly ionized, is recently discovered likewise in atomic, molecular, biological, and nanostructured systems. Any theoretical prediction of it relies strongly on an accurate treatment of the involved resonance and continuum states. Here, we describe laser-induced ICD in quantum dots with electron dynamics at a multiconfiguration time-dependent Hartree-Fock level for the first time for a two-dimensional continuum, which was possible by implementing an efficient Multigrid POTFIT representation of the Coulomb interaction, such that ICD control with laser polarization is within reach. Conclusively, ICD turns out to be much faster in laterally-arranged self-assembled or lithographic quantum dots connected to a twodimensional wetting-layer continuum than in previously investigated dots in nanowires.

Abstrmt-A novel technique for detecting immunochemical reactions based on a SQUID measurement system has recently been demonstrated. The reaction partners are labeled by magnetic nanoparticles which, after an immunochemical reaction, display changes of their magnetic relaxation behaviour due to a reduction of their mobility. We have developed a SQUID system dedicated to magnetic relaxation immunoassays (MARIAs) operating in unshielded environment. The system consists of 6 SQUID magnetometers electronically combined to a second-order gradiometer. The gradiometer is formed by electronic subtraction of FLL output signals or by the Three SQUID Gradiometer approach. By evaluating the amplitude of relaxation signals (average of 4 magnetization cycles) a minimnm amount of (selected) Fe20-j-particles corresponding to 600 pmol Fe was detected demonstrating the potential of the measurement system for biochemical laboratory diagnostics.