By means of a high resolution resonant inelastic x-ray scattering spectroscopy, we have for the first time separated spectral features pertaining to different two-electron atomic processes in the vicinity of an innershell threshold. Contributions of double excitations were extracted from the Ar KM-M2,3M x-ray satellite line intensity measured as a function of photon energy from 1s3p double excitation threshold to saturation. The isolated [1s3p]nln'l' excitation spectrum is critically compared to the outcome of the multiconfiguration Dirac-Fock model with relaxation.
COBISS.SI-ID: 22543143
We present a theoretical interpretation of recent experimental results on multiphoton multiple ionization of xenon by soft-x-ray radiation of photon energy 93 eV and intensity up to 10^16 W/cm2. The data are interpreted within multiphoton perturbation theory, taking into account the spatiotemporal distribution of the radiation.
COBISS.SI-ID: 22642471
We present spectra of triplet and singlet metastable helium atoms resonantly photoexcited to doubly excited states. The first members of three dipole-allowed 1,3^P^o series have been observed and their relative photoionization cross sections determined, both in the triplet (from 1s2s 3^S^e) and singlet (from 1s2s 1^S^e) manifolds.
COBISS.SI-ID: 22560039
The aim of this work is to present a theoretical model that describes the micro-PIXE intensities in confocal geometry in the case of either layered structured materials or materials composed of major–minor elements exhibiting concentration gradients within depth. The influence of various experimental parameters such as the beam energy, spatial resolution of the X-ray lens, micro-beam dimensions, irradiation and detection angles, as well as the structure (thickness, composition) of the individual layers that compose the analyzed sample, is investigated by means of simulations.
COBISS.SI-ID: 22579495
X-ray atomic absorption of iodine in the energy region of the K edge is determined from the absorption of iodine vapor at temperatures up to 1000 °C with appreciable dissociation of the molecular species. The atomic signal is obtained as a linear combination of the highest-temperature absorption spectra at two vapor densities; the coefficients of the combination are determined from extended x-ray absorption fine structure (EXAFS) analysis of the molecular signal.
COBISS.SI-ID: 1075195