Dear Rietvelders, As an addition to the remarks made already, I would like to mention a few other cases where variable slits can be useful: - when performing diffraction measurements at elevated temperatures using non-ambient chambers with heating strips: the use of a constant irradiated area ensures that the temperature drop-off stays constant throughout the 2Theta range. In fact, variable slits are useful for non-ambient work in general as the samples are generally smaller than what is normally used. - when measuring very small amounts of low-Z powders on a zero-background plate in the Bragg-Brentano geometry - by working in constant area mode and assuming 100% transparency of the sample one has the same 'constant volume' as in conventional XRD with fixed slits on bulk samples.
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