Annual Report 2002 - Helmholtz-Zentrum Berlin

helmholtzberlin

Annual Report 2002 - Helmholtz-Zentrum Berlin

Table of Contents

Table of Contents

Foreword ............................................................................................................................................................... V

STRUCTURAL RESEARCH........................................................................................................ 1

Large Scale Facilities / User Service

BENSC – Berlin Neutron Scattering Center ............................................................................................

- BENSC-Operation 2

- Neutron spin echo technique for neutron reflectometry ........................................................................... 5

- Resolution Theory for Neutron Spin Echo Spectroscopy on Three-Axis Spectrometers ......................... 6

- Multi-spectral neutron beam extraction ................................................................................................... 7

- Interaction of enzymes with artificial interfaces ....................................................................................... 8

- Critical adsorption in binary liquid mixtures by neutron reflectivity: Evidence for two-phase adsorption

.......................................................................................................................................................... 9

- Field-induced condensation of magnons in an axial Haldane-gap antiferromagnet................................. 10

- Bose-Einstein Condensation in dimer quantum spin systems ................................................................ 11

- Investigation of the microstructure of ferrofluids using SANS .................................................................. 12

ISL – Ion Beam Laboratory

- ISL Operations and Developments ......................................................................................................... 13

- Injector Developments at ISL................................................................................................................... 15

- Design Study for a 250 MeV-Proton Therapy Facility in Berlin ............................................................... 17

- Coulomb explosions of H2O molecules in interactions with highly charged ions ..................................... 19

- Selforganisation of NiO layers under swift heavy ion irradiation ............................................................. 21

- Stoichiometry and density of reactively sputtered WSx thin films ............................................................ 22

HMI at BESSY

- The elliptical undulator UE46 of high brilliance and variable polarization for studies of magnetic

nanostructures at BESSY ....................................................................................................................... 24

- A Self-Consistent Method for Multiaxial Residual Stress Analysis by Energy-Dispersive Diffraction ...... 25

- Micro-Tomography for structural analysis of metallic foams ................................................................... 26

- Texture modification in titanium layers with heavy ions .......................................................................... 27

NAA-Laboratory and Irradiation Service at BER II

- Neutron Activation Service at BER II .............................................................................................. 29

Scientific Departments

SF1 – Methods and Instruments

- Fe(NCS)2(d4-pyrazine)2:A molecular-based system that behaves as a 2D S=1/2 Ising square lattice .... 30

- Free quantum rotors in inclusion compounds: a study of NH3 rotations in Hofmann-type clathrates

using neutron spectroscopy .................................................................................................................... 31

- New integration method for three-dimensional Bragg peaks .................................................................. 32

- Neutron generation with GeV protons in massive target blocks .............................................................. 33

SF2 – Magnetism

- A frustrated molecular magnet ................................................................................................................ 34

- Studies of U2Pd2In single crystal up to 17 T ............................................................................................ 35

- Exposure of the EXAFS background ...................................................................................................... 36

SF3 – Materials

- Chemical gradients in superalloy Inconel 706 ......................................................................................... 37

- Structure investigations in nanomaterials using SANS ........................................................................... 38

SF4 – Structure and Dynamics

- Guided transmission of 3 keV Ne7+ ions through nanocapillaries in PET polymers: dependence on

the capillary diameter .............................................................................................................................. 41

- Ion-track based microstructures for electronic applications .................................................................... 42

- Thermal-spike-induced crystal growth in nanocrystalline nickel .............................................................. 43

- ASPIC*: Dominance of coordination-number dependence in a zero-dimensional magnetic system ...... 44

- Anomalous emission of secondary positive ions from BeO films irradiated by swift Au Ions .................. 45

- Giant Barkas effect observed for light ions channelling in Si .................................................................. 46

HMI Annual Report 2002 III

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