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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 49914.0, MPI für Polymerforschung / MPI Polymerforschung
Photon correlation spectroscopy with high-energy coherent x rays
Authors:Thurn-Albrecht, T.; Zontone, F.; Grübel, G.; Steffen, W.; Müller-Buschbaum, P.; Patkowski, A.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Review E
Journal Abbrev.:Phys. Rev. E
Volume:68
Issue / Number:3
Sequence Number of Article:031407
Review Status:not specified
Audience:Not Specified
Abstract / Description:We performed x-ray photon correlation spectroscopy on a model suspension of colloidal particles using x rays of three different energies, namely, 8 keV, 13.5 keV, and 19 keV . The observed reduction in the degree of coherence with increasing x-ray energy, as measured by the contrast of the correlation functions, is consistent with theoretical estimates. We show that it is well possible and under certain circumstances even advantageous to perform experiments with coherent x rays at these higher energies. We argue that the reduced absorption may not only allow for thicker samples but also for longer acquisition times because of the reduced radiation damage, thus outweighing in many cases the effect of the reduced coherent flux. The use of higher energy x rays for photon correlation spectroscopy can therefore lead to a substantial increase in the signal-to-noise ratio and constitutes a promising option for future experiments on samples of polymeric or biological origin.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Halle Wittenberg, Dept Phys, D-06099 Halle Saale, Germany; Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany; European Synchrotron Radiat Facil, F-38043 Grenoble, France; Tech Univ Munich, Dept Phys, D-85747 Garching, Germany; Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland
Identifiers:LOCALID:P-03-69
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