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A. Wilson, C. Holbrow (1963)
X-Ray OpticsAmerican Journal of Physics, 31
Apparent particle sizes corresponding to the slope and intercept of the variance‐range curve are interpreted geometrically; the analytical results of Lele & Anantharaman for cylinders and certain prisms are confirmed. The slope apparent particle size is half the harmonic mean of hsec ϕ and bcsc ϕ, where h is the height of the cylinder or prism, b is the breadth of a rectangle having an area equal to that of its top face and a width equal to that of its radiation shadow, and ϕ is the angle between its axis and the diffraction vector. For cylinders, but not in general for prisms, the intercept apparent particle size is 1/√2 times the geometric mean of the same quantities. For a hemisphere of diameter d the slope apparent particle size is given by d/(1 + cos ϕ), where ϕ is the angle between the diffraction vector and the normal to the plane face, and the intercept apparent particle size is the square root of πd2csc 2ϕ.
Journal of Applied Crystallography – Wiley
Published: Oct 2, 1969
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