Figure3

Figure 3. Instantaneous atomic displacements $$ {\overline{u}}_0 $$ and $$ {\overline{u}}_1 $$, instantaneous interatomic distance $$ \overline{r} $$ and distance $$ \overline{R} $$ between the equilibrium positions. EXAFS probes the instantaneous distance $$ r $$, while Bragg diffraction measures the equilibrium distance $$ R $$.