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- W1963601781 abstract "A treatment is given in terms of Δω, Δ2θ(s) space of the system involving an X-ray source, a crystal monochromator and a single-crystal diffractometer. The interaction of the wavelength dispersion of the monochromator crystal, M, and that of the small specimen crystal, C, is examined for various orientations of the axis of M relative to that of C. A simple diagrammatic representation of the wavelength dispersion of the system is derived. These diagrams encompass the parallel, antiparallel and crossed-crystal arrangements and are equivalent to the theoretical relation {{Delta omega}over{Delta 2theta}} = {{k (tan theta _{C} + cos varphi _{M}tan theta _{M})}over{k (2tan theta _{C} + cos varphi _{M}tan theta _{M})}}; Δω is the angular displacement of C and Δ2θ the corresponding displacement in detector space, θC the Bragg angle of C and θM that of M while k = (Δλ/λ) tan θM and ϕM is the angle between the axes of C and M. From the principle of reciprocity in optics, the functional dependence of the radiation that arrives at the small specimen crystal from an extended source via the monochromator is investigated in terms of the mosaic spread of M, the depth of beam penetration into M and the wavelength band. Combination of the wavelength dispersion and the source size/monochromator mosaicity with the mosaic spread of the specimen crystal yields the corresponding Δω, Δ2θ(s) diagrams. For the case where the rotation axes of the M and C crystals are parallel, the general form of the intensity distributions is examined for selected values of tan θC relative to tan θM." @default.
- W1963601781 created "2016-06-24" @default.
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- W1963601781 date "1985-07-01" @default.
- W1963601781 modified "2023-09-25" @default.
- W1963601781 title "Small-crystal X-ray diffractometry with a crystal ante-monochromator" @default.
- W1963601781 doi "https://doi.org/10.1107/s010876738500068x" @default.
- W1963601781 hasPublicationYear "1985" @default.
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