The analysis of a pioneering experiment, the first measurement of photoionization of helium in the strong electric field up to 100 kV/cm (Harries et al., Phys. Rev. Lett. 90, 133002, 2003) requires an approach beyond the simple perturbation theory. The problem was solved by implementation of the complex rotation method which takes into account bound-continuum state interaction to all orders. We calculated for the first time radiative decay probabilities and inelastic VUV scattering probablity in the region of doubly excited states in the strong field environment.
COBISS.SI-ID: 20835111
Important achievement in X-ray absorption studies of atomic and complex systems. For the experiments with monatomic samples (Cs, I, K, Zn, Cd) we devised and built high-temperature (800 C – 1000 C) absorption cells, with specific adaptations to the thermal and chemical properties of the elements. Some of these measurements have also been published as the first metrologically precise absolute determinations of the absorption cross section.
COBISS.SI-ID: 2053732
We have studied spontaneous ordering and self recognition of amino acid L-methionine (L-m) molecular assemblies on Ag(111). From STM and helium diffraction we observe spontaneous ordering into extended molecular chains oriented along the subjacent atomic lattice. Highly regular biomolecular gratings evolve with periodicity that can be tuned at the nanometer scale by the methionine surface concentration. This is an example of a general construction motif to achieve biomolecular nanoarchitectures on surfaces.
COBISS.SI-ID: 1985636
By observing soft x-rays emitted from the target after a few MeV proton beam bombardment we have shown that our home made spectrometer runs efficiently with an energy resolution better than the natural width of the inner shell transitions. In our first studies at synchrotron Elettra (@XAFS beamline) we have recorded x-ray Raman spectra in the vicinity of L3 edge in Xe with 3-times better resolution then previously available, allowing a clear detection of 2p-6s excitation.
COBISS.SI-ID: 21055015
In collaboration with Institute of Nuclear Physics (NCSR “Demokritos”, Athens, Greece) and Institute of Optics and Atomic Physics (Technical University of Berlin, Germany) we have set up at the Institute "Jožef Stefan" Tandetron site the first confocal measurements in which the sample is moved through the sensitive microvolume, formed at the common focal point of the ion microbeam probe and x-ray polycapillary. We have shown the method capability in case of element-selective 3D tomography of aerosol sample.
COBISS.SI-ID: 21971495