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Figure 1
An X-ray diffraction pattern of a PM film recorded on an IP with the Guinier camera. PM is a well ordered two-dimensional crystal of BR trimers arranged in a hexagonal lattice belonging to plane group p3. The right-hand edge of the image corresponds to a resolution of 3.5 Å. The plane of the film is parallel to the incident X-ray, and the normal of the film is parallel to the vertical of the image. The arc across the equatorial line indicates the imperfect orientations of PMs in the film sample. Along the meridional axis, strong lamellar diffraction peaks coming from the layers of PM are seen. Miller indices of some reflections [(1 1), (2 0), (7 1) and (11 3)] are indicated. The (7 1) and (11 3) reflections correspond to a spacing of 7.0 Å and 4.2 Å. Dotted lines indicate edges of the sector within which a one-dimensional diffraction profile was circularly integrated and averaged (see Fig. 2[link]). The central angle of the sector is 20°.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 13| Part 3| April 2006| Pages 281-284
doi:10.1107/S0909049506004766
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