REFDELF ABSORB

4.3 - Refined Absorption Methods


These methods are the least scientifically valid methods, in that they require a refined model, and provide a "correction" for the data based on the assumption that any consistent differences between the calculated and observed structure factors are due to absorption.

They have fallen out of favour in the recent past, but if numerical corrections cannot be carried out, and if no extra intensities were measured, then these methods remain the only ones capable of providing some sort of correction for absorption. For most crystals containing elements heavier than the first row transition metals, it is likely that absorption is the single most important contributor to the systematic errors.