TY  - JOUR
A1  - Panzner, Tobias
A1  - Gleber, Gudrun
A1  - Sant, Tushar
A1  - Leitenberger, Wolfram
A1  - Pietsch, Ullrich
T1  - Coherence experiments at the white-beam beamline of BESSYI
N2  - The third-generation X-ray source BESSYII (Berlin, Germany) provides coherent X-ray radiation which can be used for static and dynamic speckle analysis. Recently we have demonstrated that one can perform experiments with coherent white radiation provided by a bending magnet (5 < E < 20 keV). In this paper we show that the diffraction figure of the initial pinhole must be considered for the interpretation of coherent experiments. The reflectivity spectrum of a sample results from the Fresnel diffraction of the incident pinhole deformed by the static speckle features of the sample surface. For dynamical experiments all speckle like features alter with time whereas the pure Fresnel fringes remain constant. (c) 2007 Published by Elsevier B.V.
Y1  - 2007
UR  - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TW0-4N08M4P-1- F&_cdi=5548&_user=1584062&_orig=search&_coverDate=05%2F23%2F2007&_sk=994849985&view=c&wchp=dGLbVzW- zSkWA&md5=3a09375f874dccd9b382488e9d0
U6  - https://doi.org/10.1016/j.tsf.2006.12.002
ER  - 
TY  - JOUR
A1  - Brajpuriya, Ranjeet
A1  - Tripathi, Sumit
A1  - Sharma, Abhishek
A1  - Chaudhari, S.M.
A1  - Phase, D.M.
A1  - Gupta, Ajay
A1  - Shripathi, Thoudinja
A1  - Leitenberger, Wolfram
A1  - Pietsch, Ullrich
A1  - Laxmi, N.
T1  - Temperature dependent energy-dispersive X-ray diffraction and magnetic study of Fe/Al interface
N2  - In situ temperature dependent energy-dispersive structural and magnetic study of electron beam evaporated Fe/Al multilayer sample (MLS) has been investigated. The structural studies show the formation of an intermixed FeAl transition layer of a few nanometers thick at the interface during deposition, which on annealing at 300 degrees C transforms to B2FeAl intermetallic phase. Magnetization decreases with increase in temperature and drops to minimum above 300 degrees C due to increase in anti-ferromagnetic interlayer coupling and formation of nonmagnetic FeAl phase at the interface. The Curie temperature (T-c) is found to be 288 degrees C and is much less than that of bulk bcc Fe.
Y1  - 2007
UR  - http://www.sciencedirect.com/science/journal/01694332
U6  - https://doi.org/10.1016/j.apsusc.2007.04.069
SN  - 0169-4332
ER  - 
TY  - JOUR
A1  - Leitenberger, Wolfram
A1  - Pietsch, Ullrich
T1  - A monolithic Fresnel bimirror for hard X-rays and its application for coherence measurements
N2  - Experiments using a simple X-ray interferometer to measure the degree of spatial coherence of hard X-rays are reported. A monolithic Fresnel bimirror is used at small incidence angles to investigate synchrotron radiation in the energy interval 5-50 keV with monochromatic and white beam. The experimental setup was equivalent to a Young's double-slit experiment for hard X-rays with slit dimensions in the micrometre range. From the high-contrast interference pattern the degree of coherence was determined.
Y1  - 2007
UR  - http://journals.iucr.org/s/issues/2007/02/00/wl5137/wl5137.pdf
U6  - https://doi.org/10.1107/S0909049507003846
SN  - 0909-0495
ER  -