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  - Karcenko, Anatolij V.
A1  - Englisch, Uwe
A1  - Grenzer, Jörg
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
A1  - Siebrecht, R.
T1  - Investigation of partially deuterated multilayers by means of X-ray and polarized neutron reflectometry
Y1  - 2000
SN  - 1044-8632
ER  - 
TY  - JOUR
A1  - Thünemann, Andreas F.
A1  - Kubowicz, Stephan
A1  - Pietsch, Ullrich
T1  - Ultra-thin solid polyelectrolyte-surfactant complex films : structure and wetting
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation of a buried lateral density grating in azopenzene polymer films
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Darowski, Nora
A1  - Ulyanenkov, A.
A1  - Grenzer, Jörg
A1  - Wang, K. H.
A1  - Forchel, Alfred
T1  - Analysis of the strain distribution in lateral nanostructures for interpreting photoluminescence data
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Stahn, Jochen
A1  - Geue, Thomas
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
T1  - Interaction of short-chain alkanes with surface and interfaces of multilayer films built from amphiphilic molecules: an in-situ X-ray and neutron scattering probe
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Neumann, Werner
A1  - Buchsteiner, Alexandra
A1  - Mahler, Willy
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
T1  - Dielectric loss spectroscopy at fatty acid salt multilayers
N2  - Dielectric loss spectroscopy (DLS) was performed at compact samples and lamellary organized Langmuir-Blodgett (LB) films from various fatty acid salts. Previous thermoanalytical measurements at compact samples revealed the appearance of two different phase transition temperatures; the lower one is related to the acid the second one to the acid salt molecules. In spite of ill defined electrical contacts with the film the characteristic DLS frequencies obtained from about 100nm thick multilayer films are similar to those recorded from bulk samples. No significant variations of frequencies were found changing the counter ions. Besides conductivity influence at low frequncies we found two relaxations related to the mobility of the dipolar carboxylat-metal group at about 100 and 10000Hz. One of these frequencies is related to the rotation around the chain axis. The strength of this relaxation increases significantly with increasing the sample temperature above 105°C. This temperature is connected with a structural phase transition observed by X-ray reflectometry. In case of Pb-stearate the results of the dielectric measurements help to interprete this structural change as a transition from an orthorhombic into a free-rotator phase. The uncorrelated rotation of molecules around their molecular axes initiates a much increased relaxation strength at the carboxylat-metal sites.
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Mukhopadhyay, M. K.
A1  - Datta, A.
A1  - Sanyal, M. K.
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
T1  - Synchrotron Studies of Melting of Langmuir-Blodgett Films
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Avilov, Anatoly S.
A1  - Lepeshov, G. G.
A1  - Pietsch, Ullrich
A1  - Tsirelson, Vladimir G.
T1  - Multipole analysis of the electron density and electrostatic potential in Germanium by high-resolution electron diffraction
Y1  - 2001
SN  - 0022-3697
ER  - 
TY  - JOUR
A1  - Davaasambuu, Jav
A1  - Daniel, A.
A1  - Stahn, Jochen
A1  - Pietsch, Ullrich
T1  - Comparison of experimental and theoretical valence charge densites in cubic ZnSe
Y1  - 2001
SN  - 0022-3697
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  - Zeimer, Ute
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
A1  - Bugge, F.
A1  - Smirnitzki, V.
A1  - Weyers, Markus
T1  - Investigation of strain-modulated InGaAs-nanostructures by grazing-incidence x-ray diffraction and photoluminescence
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Zeimer, Ute
A1  - Bugge, F.
A1  - Gramlich, S.
A1  - Smirnitzki, V.
A1  - Weyers, Markus
A1  - Tränkle, G.
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
A1  - Cassabois, G.
A1  - Emiliani, V.
A1  - Linau, Christoph
T1  - Evidence of strain-induced lateral carrier confinement in InGaAs-quantum wells by low-temperature near-field spectroscopy
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Grenzer, Jörg
A1  - Geue, Thomas
A1  - Neißendorfer, Frank
A1  - Brezesinski, Gerald
A1  - Symietz, Christian
A1  - Möhwald, Helmuth
A1  - Gudat, Wolfgang
T1  - The energy dispersive reflectometer at BESSY II : a challenge for thin film analysis
Y1  - 2001
SN  - 0167- 5087
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Zeimer, Ute
A1  - Hofmann, L.
A1  - Grenzer, Jörg
A1  - Gramlich, S.
T1  - Strain induced compositional modulations in AlGaAs overlayers induced by lateral surface gratings
Y1  - 2001
SN  - 0272-9172
ER  - 
TY  - JOUR
A1  - Davaasambuu, Jav
A1  - Daniel, A.
A1  - Stahn, Jochen
A1  - Pietsch, Ullrich
T1  - Harmonic and anharmonic thermal vibrations in cubic ZnSe
Y1  - 2001
SN  - 0044-2968
ER  - 
TY  - JOUR
A1  - Tsirelson, Vladimir G.
A1  - Avilov, Anatoly S.
A1  - Lepeshov, G. G.
A1  - Kuligin, A. K.
A1  - Stahn, Jochen
A1  - Pietsch, Ullrich
A1  - Spence, J. C. H.
T1  - Quantitative Analysis of the Inner-Crystal Electrostatic Potential of several Rock-Salt-Structure Crystals Using Accurate Electron-Diffraction Data
Y1  - 2001
SN  - 1089-5647
ER  - 
TY  - JOUR
A1  - Stahn, Jochen
A1  - Pietsch, Ullrich
A1  - Blaha, Pawel
A1  - Schwarz, K. H.
T1  - Electric field induced charge-density variations in covalently bonded compounds
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Poloucek, P.
A1  - Pietsch, Ullrich
A1  - Geue, Thomas
A1  - Symietz, Christian
A1  - Brezesinski, Gerald
T1  - X-ray reflectivity analysis of thin complex Langmuir-Blodgett films
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Stahn, Jochen
A1  - Davaasambuu, Jav
A1  - Pucher, Andreas
T1  - Electric field induced charge density variations in partially-ionic compounds
Y1  - 2001
SN  - 0022-3697
ER  -