Abstract
THE large lattice spacings occurring in such organic matter as fibres or crystalline viruses give rise to X-ray diffraction patterns with Bragg angles of minutes of arc rather than of degrees. The neighbourhood of the direct beam is, however, for a variety of reasons, easily obscured by scattered radiation and insufficient collimation, so that special measures such as very long film-specimen distances1 or focusing crystal monochromators2 have been used for obtaining satisfactory photographs. In particular, Furnas3 has recently made an important contribution to the latter method.
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References
Bear, J., J. Amer. Chem. Soc., 66, 1297 (1944).
Guinier, A., and Fournet, G., C.R. Acad. Sci., Paris, 226, 656 (1948).
Furnas, T. C., “The Development of Focusing X-ray Cameras for Use at Small Diffraction Angles” (Mass. Inst. Tech. thesis, 1952).
Ehrenberg, W., J. Opt. Soc. Amer., 39, 741 (1949).
Ehrenberg, W., and Spear, W. E., Proc. Phys. Soc., B, 64, 67 (1951).
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EHRENBERG, W., FRANKS, A. Small-Angle X-Ray Scattering. Nature 170, 1076–1077 (1952). https://doi.org/10.1038/1701076a0
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DOI: https://doi.org/10.1038/1701076a0
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