TY  - JOUR
A1  - Geue, Thomas
A1  - Henneberg, Oliver
A1  - Pietsch, Ullrich
T1  - X-ray reflectivity from sinusoidal surface relief gratings
Y1  - 2002
SN  - 0023-4753
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
A1  - Haferkorn, J.
A1  - Stumpe, Joachim
A1  - Date, R. W.
A1  - Fawcett, A. H.
T1  - Competition of alignment and aggregation? : Phenomena in constrained films of LC poly(olefin ulfone)s and maleic anhydride co- and terpolymers
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Henneberg, Oliver
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation mechanism and dynamics in polymer surface gratings
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Schultz, M.
A1  - Englisch, Uwe
A1  - Stömmer, Ralph
A1  - Pietsch, Ullrich
A1  - Meine, Kerstin
A1  - Vollhard, D.
T1  - Investigation of pH-dependent domain structure of fatty acid salt Langmuir-Blodgett films by means of X-ray diffuse scattering and Atomic Force Microscopy
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Stumpe, Joachim
A1  - Pietsch, Ullrich
A1  - Haak, M.
A1  - Kaupp, G.
T1  - Photochemically induced changes of optical anisotropy and surface of LB-multilayers built up by an amphiphilic and liquid crystalline copolymer conating azobenzene moieties
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Gorfman, S. V.
A1  - Tsirelson, Vladimir G.
A1  - Pietsch, Ullrich
T1  - X-ray diffraction by a crystal in a permanent external electric field : general considerations
N2  - The variations of X-ray diffraction intensities from a crystal in the presence of a permanent external electric field is modeled analytically using a first-order stationary perturbation theory. The change in a crystal, induced by an external electric field, is separated into two contributions. The first one is related to a pure polarization of an electron subsystem, while the second contribution can be reduced to the displacements of the rigid pseudoatoms from their equilibrium positions. It is shown that a change of the X-ray diffraction intensities mainly originates from the second contribution, while the influence of the pure polarization of a crystal electron subsystem is negligibly small. The quantities restored from an X-ray diffraction experiment in the presence of an external electric field were analyzed in detail in terms of a rigid pseudoatomic model of electron density and harmonic approximation for the atomic thermal motion. Explicit relationships are derived that link the properties of phonon spectra with E-field-induced variations of a structure factor, pseudoatomic displacements and piezoelectric strains. The displacements can be numerically estimated using a model of independent atomic motion if the Debye - Waller factors and pseudoatomic charges are known either from a previous single-crystal X-ray diffraction study or from density functional theory calculations. The above estimations can be used to develop an optimum strategy for a data collection that avoids the measurements of reflections insensitive to the electric-field-induced variations
Y1  - 2005
SN  - 0108-7673
ER  - 
TY  - JOUR
A1  - Grenzer, Jörg
A1  - Darowski, Nora
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
A1  - Daniel, A.
A1  - Rennon, Siegfried
A1  - Reithmaier, Johann-Peter
A1  - Forchel, Alfred
T1  - Strain analysis and quantum well intermixing of a laterally modulated multiquantum well system produced by focused ion beam implantation
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Grenzer, Jörg
A1  - Darowski, Nora
A1  - Pietsch, Ullrich
A1  - Daniel, A.
A1  - Reithmaier, Johann-Peter
A1  - Rennon, Siegfried
A1  - Forchel, Alfred
T1  - Grazing-incidence diffraction strain analysis of a laterally-modulated multiquantum well system produced by focused-ion-beam implantation
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Grenzer, Jörg
A1  - Schomburg, E.
A1  - Lingott, I.
A1  - Ignotov, A. a.
A1  - Renk, K. F.
A1  - Pietsch, Ullrich
A1  - Rose, Dirk
A1  - Zeimer, Ute
A1  - Melzer, B. J.
A1  - Ivanov, S.
A1  - Schaposchnikov, S.
A1  - Kop'ev, P. S.
A1  - Pavel'ev, D. G.
A1  - Koschurinov, Yu.
T1  - X-ray and transport characterization of an Esaki-Tsu superlattice device
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Haier, P.
A1  - Herrmann, B. A.
A1  - Esser, N.
A1  - Pietsch, Ullrich
A1  - Lüders, K.
A1  - Richter, W.
T1  - Influence of the deposition rate on the structure of thin metal layers
Y1  - 1998
ER  -