Electronic Resource
Copenhagen
:
International Union of Crystallography (IUCr)
Applied crystallography online
25 (1992), S. 571-577
ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
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 108 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 1010 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889892004102
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