A small-angle scattering chamber for x-ray photon correlation spectroscopy at low temperatures

2011 ◽  
Vol 82 (2) ◽  
pp. 025109 ◽  
Author(s):  
Ricardo Steinmann ◽  
Yuriy Chushkin ◽  
Chiara Caronna ◽  
Joel Chavanne ◽  
Anders Madsen
Keyword(s):  
Small Angle ◽  
Low Temperatures ◽  
Photon Correlation Spectroscopy ◽  
Small Angle Scattering ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
X Ray ◽  
Angle Scattering ◽  
Scattering Chamber

scholarly journals Atomic Migration Studies with X-Ray Photon Correlation Spectroscopy

2014 ◽  
Vol 2 ◽  
pp. 73-94 ◽  
Author(s):  
Markus Stana ◽  
Manuel Ross ◽  
Bogdan Sepiol
Keyword(s):  
Low Temperatures ◽  
Short Range ◽  
Short Range Order ◽  
Photon Correlation Spectroscopy ◽  
Condensed Matter ◽  
Correlation Spectroscopy ◽  
Atomic Scale ◽  
Photon Correlation ◽  
X Ray ◽  
Amorphous Systems

The new technique of atomic-scale X-ray Photon Correlation Spectroscopy (aXPCS) makesuse of a coherent X-ray beam to study the dynamics of various processes in condensed matter systems.Particularly atomistic migration mechanisms are still far from being understood in most of intermetallicalloys and in amorphous systems. Special emphasis must be given to the opportunity to measureatomistic diffusion at relatively low temperatures where such measurements were far out of reach withpreviously established methods. The importance of short-range order is demonstrated on the basis ofMonte Carlo simulations.

scholarly journals Multi-speckle X-ray photon correlation spectroscopy in the ultra-small-angle X-ray scattering range

2016 ◽  
Vol 23 (4) ◽  
pp. 929-936 ◽  
Author(s):  
Johannes Möller ◽  
Yuriy Chushkin ◽  
Sylvain Prevost ◽  
Theyencheri Narayanan
Keyword(s):  
Small Angle ◽  
Photon Correlation Spectroscopy ◽  
Photon Counting ◽  
High Sensitivity ◽  
Correlation Spectroscopy ◽  
Colloidal Systems ◽  
Photon Correlation ◽  
Length Scales ◽  
X Ray ◽  
New Research

Multi-speckle X-ray photon correlation spectroscopy (XPCS) measurements in the ultra-small-angle range are performed using a long pinhole collimation instrument in combination with two-dimensional photon-counting and high-sensitivity imaging detectors. The feasibility of the presented setup to measure dynamics on different time and length scales pertinent to colloidal systems is shown. This setup offers new research opportunities, such as for example in the investigation of non-equilibrium dynamics in optically opaque, complex systems over length scales from tens of nanometres to several micrometres. In addition, due to the short duration of the X-ray exposure involved in the ultra-small-angle range, possible radiation-induced effects are alleviated. Furthermore, the performance of two different detectors, a photon-counting Pilatus 300K and an integrating FReLoN CCD, are compared, and their applicability for accurate XPCS measurements is demonstrated.

Surface Diffusion and Island Growth

2007 ◽  
Vol 263 ◽  
pp. 177-182 ◽  
Author(s):  
Rüdiger Reitinger ◽  
B. Pfau ◽  
L.M. Stadler ◽  
S. Stankov ◽  
M. Zajac ◽  
...  
Keyword(s):  
Small Angle ◽  
Photon Correlation Spectroscopy ◽  
Grazing Incidence ◽  
Correlation Spectroscopy ◽  
Island Growth ◽  
Conducting Surface ◽  
Photon Correlation ◽  
X Ray ◽  
X Ray Scattering ◽  
Coarsening Dynamics

Grazing-Incidence Small Angle X-ray Scattering (GISAXS) and X-Ray Photon Correlation Spectroscopy (XPCS) studies of island growth in two different systems are presented: 5 ML of iron on MgO(001) and 10 ML of iron on Au(001). Due to a missing conducting surface Fe/MgO thinner than approximately 20 ML could not be studied previously by common methods like STM. Fe/Au(001) is interesting as atoms of gold diffuse easily through iron layers and form precipitates. The coarsening dynamics of these precipitates is investigated by XPCS in GISAXS geometry. Their growth depends on the crystallographic directions of the substrate and correlates with the morphology measured by STM microscopy. Measurements were performed at the ESRF in Grenoble.

scholarly journals Ultra-small-angle X-ray photon correlation spectroscopy using the Eiger detector

2018 ◽  
Vol 25 (6) ◽  
pp. 1753-1759 ◽  
Author(s):  
T. Zinn ◽  
A. Homs ◽  
L. Sharpnack ◽  
G Tinti ◽  
E Fröjdh ◽  
...  
Keyword(s):  
Small Angle ◽  
Photon Correlation Spectroscopy ◽  
Single Photon ◽  
Photon Counting ◽  
Correlation Spectroscopy ◽  
Frame Rate ◽  
Array Detector ◽  
Successful Implementation ◽  
Photon Correlation ◽  
X Ray

Successful implementation of the single-photon-counting Eiger 500k pixel array detector for sub-millisecond X-ray photon correlation spectroscopy (XPCS) measurements in the ultra-small-angle scattering region is reported. The performance is demonstrated by measuring the dynamics of dilute silica colloids in aqueous solvents when the detector is operated at different counter depths, 4, 8 and 12 bit. In the fastest mode involving 4 bit parallel readout, a stable frame rate of 22 kHz is obtained that enabled measurement of intensity–intensity autocorrelation functions with good statistics down to the 50 µs range for a sample with sufficient scattering power. The high frame rate and spatial resolution together with large number of pixels of the detector facilitate the investigation of sub-millisecond dynamics over a broad length scale by multispeckle XPCS. This is illustrated by an example involving phoretic motion of colloids during the phase separation of the solvent.

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