Journal Article

The peak profiles of standard reference materials have been investigated with energy-dispersive X-ray diffraction at a synchrotron source. Keeping the detector dead time below 2%, the peak profiles were essentially pure Gaussians independent of energy in the range investigated. [...]

The local structure around the Cu atoms in rare earth (RE) doped (La,Sr)2CuO4 has been studied by means of measuring the X-ray absorption fine structure (XAFS) at the Cu K-edge. On the local scale the tilting angle of the oxygen octahedra surrounding a Cu atom depends on the Sr and RE content. [...]

Nanoscale clusters are often formed during heteroepitaxial crystal growth. Misfit between the lattice parameter of the substrate and the adsorbate stimulates the formation of regular clusters with a characteristic size. [...]

High energy photon diffraction measurements on molten ZnCl2 have been carried out in the temperature range 623–853 K. The momentum transfer range covered is 0.15 Å−1<Q<21.6 Å−1. [...]

Excitation spectra of intrinsic (IL) and extrinsic luminescence (EL) from CaWO4 and CdWO4 crystals, measured using synchrotron radiation (4–30 eV) at 8 K, have been analysed. In CaWO4 the IL (2.9 eV) is efficiently excited by photons of 5.5–7.0 eV at the creation of molecular excitons. [...]

We have studied the dewetting of thin polymer films (polystyrene) on top of different silicon substrates. With diffuse X-ray scattering and scanning-force microscopy a high in-plane resolution was achieved. [...]

Certain embeddings of the low energy SU(3) C × SU(2) L × U(1) Y gauge group within the higher dimensional symmetry lead to exotic chiral generations in addition to a number of standard generations. An example is studied, leading to an anomaly free chiral exotic generation consisting of quarks with electric charge + 1 6 and − 5 6 , the corresponding antiquarks and addition integer charged leptons. [...]

Einstein's equations with a cosmological constant in arbitrary dimensions admit solutions with unobservable internal space and flat four-dimensional space. Internal space is non-compact, has finite volume and admits a compact group of symmetries. [...]

Correlations in the W-boson and Higgs boson channels and the static energy of an external SU(2) doublet charge pair are investigated by Monte Carlo calculations in the SU(2) lattice gauge theory with a scalar Higgs doublet field. The mass ratio m W / m H and the shape of the static potential are used to obtain information on the renormalization group trajectories in the three-dimensional coupling constant space. [...]