Browsing by Author "Peng, JB"

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    Focusing monochromator and imaging-plate camera for grazing-incidence diffraction studies of thin films
    (International Union of Crystallography, 1997-08-04) Foran, GJ; Garrett, RF; Gentle, IR; Creagh, DC; Peng, JB; Barnes, GT
    A multiple-imaging-plate detector system and focusing monochromator have been developed and successfully applied to the time-resolved study of phase transitions in Langmuir–Blodgett films by grazing-incidence X-ray diffraction (GIXD). The monochromator described here combines fixed-exit-beam height with sagittal focusing of the second crystal. The design is similar to that of Matsushita et al. [Matsushita, Ishikawa & Oyanagi (1986). Nucl. Instrum. Methods, A246, 377–379], with the exception that the motion of the first crystal is achieved via a computer-controlled X-Y translation table rather than a set of cams. The second crystal is a ribbed Si(111) wafer mounted in a four-point bending mechanism. The first reported application of imaging plates to a GIXD study was carried out by our group and proved to be very successful in the determination of thin-film structure [Foran, Peng, Steitz, Barnes & Gentle (1996)[Foran, G. J., Peng, J. B., Steitz, R., Barnes, G. T. & Gentle, I. R. (1996). Langmuir, 12, 774-777.]. Langmuir, 12, 774–777]. To extend the capabilities of this system, an imaging-plate camera was designed and built which can accommodate up to 13 imaging plates (40 × 20 cm) inside the vacuum chamber of the main diffractometer at the Australian Beamline at the Photon Factory. © International Union of Crystallography