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Angular aperture |
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In a divergent beam diffractometer these include the angular aperture of
the divergence slit, the width and axial length of the receiving slit,
the angular apertures of the axial Soller slits, the length and
projected width of the x-ray source, the absorption coefficient and
axial length of the sample. From the practical point of view, each couple of
parallel foils of length d and spacing s is equivalent to a set of
narrow slits of angular aperture arctan(d/s); their filtering effect
depends not only on the incidence angle of the beam, but also on the
relative position of the beam with respect to the entrance section (a
beam very close to one of the foils is not totally equivalent to a ray
arriving in the middle between two foils). |
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