The two components of the anomalous scattering factor, f" and f', are related by the Kramers-Kronig relationship:

Once the f" spectrum is obtained experimentally from the sample crystal via fluorescence measurements, the corresponding f' spectrum may be calculated by numerical integration using the above equation.

Ethan A Merritt ©1996-2001/ merritt@u.washington.edu / Biomolecular Structure Center at UW