Figure 2
The periodic table with class A and class B heavy atoms shown in yellow and blue and intermediate elements in purple (adapted from Fig. 8.4 in Blundell & Johnson, 1976). The absorption edges (energies and wavelengths) and f′′ at the edge are shown (data from the https://skuld.bmsc.washington.edu/scatter/AS_periodic.html
website). Some elements (marked with an asterisk) have a range of absorption edges from which to choose and thus for each element an edge at a suitable energy for data collection at a synchrotron has been selected. |