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Powder diffraction in the range of milliseconds
Author(s) -
Pennartz P. U.,
Löchner U.,
Fuess H.,
Wroblewski T.
Publication year - 1992
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889892004102
Subject(s) - monochromator , beamline , optics , photodiode , synchrotron radiation , diffraction , wavelength , powder diffraction , materials science , physics , chemistry , crystallography , beam (structure)
Powder diffraction studies with synchrotron radiation were performed on a time scale down to 2.5 ms at the HASYLAB beamline B2 with a commercial 1024 pixel linear photodiode‐array detector system (OMA III, EG&G–PARC). The flux rate of 2 x 10 8 photons s −1 at a wavelength of 1.26 Å achieved by using a toroidal mirror and a standard double‐crystal Si(111) monochromator was measured with an ionization chamber at the focus. With a synthetic multilayer to select the desired wavelength instead of the standard monochromator, a flux rate of 1.5 x 10 10 photons s −1 was measured at a wavelength of 1.31 Å. The shortest possible recording times for a complete powder pattern of calcium fluoride were 200 ms with the crystal monochromator and 2.5 ms with the multilayer. The angular resolution for both cases is discussed. The high‐speed data collection was successfully applied with the double‐crystal and multilayer monochromators to the recording of more‐complex patterns and to monitor a phase transformation in order to demonstrate the feasibility of kinetic studies on the millisecond time scale.