Articles written in Journal of Chemical Sciences
Volume 92 Issue 4-5 August 1983 pp 359-377 Crystallography
The primary extinction factor yp is defined as the ratio of the integrated reflection from a coherently diffracting domain to the integrated kinematical reflection from the same domain. When yp is larger than 0.5 it may be approximated by yp
Transfer equations are applied to symmetrical Laue diffraction, and the reflectivity per unit length, Σ(ε) is solved from the measured reflecting ratio as a function of the rocking angle
Measurements with conventional x-ray sources are made on single crystal slabs of Be and Si using AgKΒ, MoKα1 and CuKα radiation. The primary extinction factor yp(
The limitations of the method are discussed in length, particularly the effects of beam divergences and incoherence of the rays in the crystal. It is concluded that under typical experimental conditions the requirements of the theory are met. Practical limitations arising from the use of characteristic wavelengths and unpolarized radiation prohibit the use of the full potential of the method.
The properties of a synchrotron radiation source are compared with a conventional x-ray source, and it is demonstrated that the experimental limitations can be removed by the use of synchrotron radiation. A diffraction experiment with synchrotron radiation is outlined, as well as generalization of the method to small spherical crystals.
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