TY  - JOUR
A1  - Geue, Thomas
A1  - Schultz, Michael
A1  - Grenzer, Jörg
A1  - Natansohn, Almeria
A1  - Rochon, Paul
T1  - X-ray investigations of the molecular mobility with polymer surface gratings
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  - Pietsch, Ullrich
A1  - Mukhopadhyay, M. K.
A1  - Sanyal, M. K.
A1  - Datta, A.
A1  - Mukherjee, M.
A1  - Geue, Thomas
A1  - Grenzer, Jörg
T1  - Transition from two-dimensional to three-dimensional melting in Langmuir-Blodgett films
N2  - Results of energy-dispersive x-ray reflectivity and grazing incidence diffraction studies of Langmuir-Blodgett films exhibited evolution of conventional three-dimensional melting from continuous melting, characteristic of two- dimensional systems, as a function of deposited monolayers. Continuous expansion followed by a sharp phase transition of the in-plane lattice was observed before the melting point and found to be independent of number of deposited layers. Evolution of conventional melting with an increase in the number of monolayers could be quantified by measuring stiffness against tilting of the vertical stack of molecules, which are kept together by an internal field. The internal field as defined in this model reduces as the in-plane lattice expands and the sample temperature approaches melting point. The sharpness of the melting transition, which has been approximated by a Langevin function, increases with the number of deposited monolayers
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Grigorian, Souren A.
A1  - Grenzer, Jörg
A1  - Vartanyants, Ivan A.
T1  - Thermal diffuse scattering in grazing incidence diffraction
Y1  - 2003
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  - Mukherjee, M.
A1  - Bhattacharya, M. K.
A1  - Sanyal, M. K.
A1  - Geue, Thomas
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
T1  - Temperature dependent thickness and surface tension of polymer films
Y1  - 2000
SN  - 81-7371295-6
ER  - 
TY  - JOUR
A1  - Bodenthin, Yves
A1  - Grenzer, Jörg
A1  - Lauter, Robert
A1  - Pietsch, Ullrich
A1  - Lehmann, Pit
A1  - Kurth, Dirk G.
A1  - Möhwald, Helmuth
T1  - Temperature and time resolved x-ray scattering at thin organic films
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Bodenthin, Yves
A1  - Grenzer, Jörg
A1  - Geue, Thomas
A1  - Möhwald, Helmuth
A1  - Kurth, Dirk G.
T1  - Structure and temperature behavior of metallo-supramolecular assemblies
N2  - A detailed structural analysis of a Langmuir-Blodgett (LB) multilayer composed of a polyelectrolyte-amphiphile complex (PAC) is presented. The PAC is self-assembled from metal ions, ditopic bis-terpyridines, and amphiphiles. The vertical structure of the LB multilayer is investigated by X-ray reflectometry. The multilayer has a periodicity of 57 A, which corresponds to an architecture of flat lying metallo-supramolecular coordination polyelectrolyte (MEPE) rods and upright-standing amphiphiles (dihexadecyl phosphate, DHP). In-plane diffraction reveals hexagonal packing of the DHP molecules. Using extended X-ray absorption fine structure (EXAFS) experiments, we prove that the central metal ion is coordinated to the terpyridine moieties in a pseudo-octahedral coordination environment. The Fe-N bond distances are 1.82 and 2.0 angstrom, respectively. Temperature resolved measurements indicate a reversible phase transition in a temperature range up to 55 degrees C. EXAFS measurements indicate a lengthening of the average Fe-N bond distance from 1.91 to 1.95 angstrom. The widening of the coordination cage upon heating is expected to lower the ligand field stabilization, thus giving rise to spin transitions in these composite materials
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Zhuang, Y.
A1  - Schelling, Christoph
A1  - Stangl, Jochen
A1  - Penn, C.
A1  - Senz, S.
A1  - Schäffler, Friedrich
A1  - Roche, T.
A1  - Daniel, A.
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
A1  - Bauer, Günther
T1  - Structural and optical properties of Si/Si{1-x}Ge{x} wires
Y1  - 2000
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  -