HASYLAB

The typical experimental setup (here the experiment established at beamline G3/ HASYLAB [12] is shown) is outlined in Figure 5. The white synchrotron radiation is monochromatized by a double crystal monochromator using the Ge (311) reflection... 

Scattering on the Triple-Axis-Diffractometer [1,2] at the HASYLAB high-energy beamline BW5 is performed in the horizontal plane using an Eulerian cradle as sample stage and a germanium solid-state detector. The beam is monochromatized by a singlecrystal monochromator (e.g. Si 111, FWHM 5.8 ), focused by various slit systems (Huber, Riso) and iron collimators and monitorized by a scintillation counter. The instrument is controlled by a p-VAX computer via CAMAC. 

Kracht, Th., SPECTRA, Technische Notiz, DESY/HASYLAB 94-01, 1994. 

Table 4.1. Performance of available point-focus setup. DORIS is an older storage ring at HASYLAB in Hamburg. The ESRF in Grenoble is an advanced synchrotron radiation source... 

Figure 4.6. Optics of beamline BW4 (USAXS) at HASYLAB, Hamburg...

Figure 4.10. Beamline BW4 at HASYLAB. View from a sample chamber along the vacuum tube towards the detector at the opposite yellow wall... 

The sample chamber contains the material that is studied in the experiment and provides for its manipulation and processing during the experiment. Figure 4.10 shows a typical sample chamber mounted at beamline BW4 of HASYLAB, Hamburg. 

Figure 4.13. mar 185 CCD-detector in operation at beamline BW4, HASYLAB at the rear end of the vacuum tube... 

Figure 4.15. Digital display and wire connections related to the 8 monitor channels which can be managed by the environmental data acquisition system of beamline BW4, HASYLAB, Hamburg... 

Figure 8.7. Peak position determination in SAXS. Isotropic polyethylene during temperature treatment measured at HASYLAB, beamline BW4 (point-focus)... 

We are grateful to HASYLAB for offering beam time on the synchrotron radiation facility of DESY and for the access to the EXAFS spectrometer. We also thank J.W. 0rnbo for help in the preparation of the samples, N.-Y. Topsjzfe for helpful discussions, and 0. Sorensen for carrying out the electron microscopy investigations. 

Saile, V. (HASYLAB, Hamburg, Germany) personal communication. Estimated cost is 5 million. 

T. B. Zunic is gratefully acknowledged for helpful discussions during preparation of the manuscript. The authors are also grateful to HASYLAB, Deutsches Elektronen-Synchrotron, Hamburg, Germany, for making available the beam time needed to develop the time-resolved techniques. 

X-ray absorption spectroscopic measurements were carried out at the storage ring DORIS III (HASYLAB DESY, Hamburg, Germany) at the EXAFS II beam line, which was equipped with a Si (111) double-crystal monochromator. All spectra were recorded at room temperature in a step-scanning mode. For data analyses the program WinXAS [17] was used. 

The Deutsche Forschungsgemeinschaft (Fr 1372/1-1 and Fr 1372/2-1) and the Fonds der Chemischen Industrie is gratefully acknowledged. We thank HASYLAB DESY for allocating beamtime and Dr. M. Tischer (HASYLAB) for help during the XAS measurements. Finally, we would like to thank Dr. M. Thommes (Quantachrome, Germany) for valuable discussions and assistance in the analysis of the physisorption data. 

Current address c/o Hamburger Synchrotronstrahlungslabor (HASYLAB) at Deutsches Elektronen-Synchrotron (DESY), NotkestraBe 85, D-22603 Hamburg, Germany... 

Figure 11.3 XANES spectra of pure Cr203 (a) and K2Cr04-4H20 (b). Note the characteristic pre-edge peak in the latter representing the 100% Crvi endmember, which is virtually absent in the 0% Crvl endmember in (a). The data were collected at the Hamburg Synchrotron Laboratory (DESY-HASYLAB).

Rare-gas samples exist only at cryogenic temperatures and most of the optical spectroscopy of electronic processes should be done in the vacuum ultraviolet. Making experiments requires an indispensable combination of liquid-helium equipment with windowless VUV-spectroscopic devices and synchrotron radiation as a photon source. To study the electronic excitation energy pathways and a variety of subthreshold inelastic processes, we used the complimentary advantages of cathodoluminescence (possibility to vary the excitation depth beneath the sample surface), photoluminescence (selective-state excitation by synchrotron radiation at high-flux SUPERLUMI-station at HASYLAB, DESY, Hamburg) and... 

Troster, Th., 1994. Ph.D. Thesis (Universitat Paderbom). Troster, Th., 1999. VUV Spectroscopy of Pr33" and Nd3+ in LaCl3. In Materlik, G., Schneider, J.R., Schulte-Schrepping, H., Franz, H. (Eds.), HASY-LAB Annual Report, Part 1. Hamburger Synchrotron-strahlungslabor HASYLAB, Hamburg. 

Quick EXAFS measurements were performed at the HASYLAB synchrotron (station XI. 1) in Hamburg, Germany. The measurements were done in transmission mode using ion chambers filled with a mixture of Ar and N2 to have an absorption of 20% in the first and of 80% in the second ion chamber. The monochromator (a double Si-111 crystal) was detuned to 50% at maximum intensity to avoid the presence of higher harmonics in the X-ray beam. In QEXAFS mode, the monochromator is in continuous motion. 

The XAS spectra of the Pt/LTL and Pt/K-Si02 samples were taken at the SRS laboratories (station 9.2) in Daresbury, UK, the spectra of the Pt/Cl-Al203 samples were taken at the ESRF (BM 29) in Grenoble, France and at the HASYLAB (XI. 1) in Hamburg, Germany. These measurements were done in transmission mode using ion chambers filled with Ar to have an... 

Jules Roelofs is acknowledged for his help and discussions concerning the synthesis of hydrotalcites. The EXAFS team is acknowledged for their help performing the EXAFS measurements in at beamline Xl. l at the HASYLAB in Hamburg. All work was supported by the Dutch science foundation NWO. The EXAFS work was also supported by the IHP-Contract HPRI-CT-1999-00040 of the European Commission. 

Hamburger Synchrotronstrahlungslabor, Winter School on ultrafast X-rays, Hamburg, Germany, 2002 (see http //www-hasylab.desy.de/conferences/ Xray-Course/, last accessed 03 September 2006)... 

Fig. 2 Simulation of two-dimensional GISAXS scattering pattern assuming an array of cylindrically shaped nano-dots (height H = 15 nm, radius R = 50 nm, aR/R = 0.25), distance D = 290 nm and w = 100 nm with a variation of the incident angle a, = a 0.01°, b 0.12°, c 0.18°, d 0.25°, e 0.45° and f 0.55°. The simulated angular range of 0.0° < af < 0.55° in vertical direction and —0.48° < x/r < 0.48° in horizontal direction is well comparable with the accessible range using a set-up at the HASYLAB. The position and size of the specular peak is exemplarily shown by the red spot...

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