Dose-dependent X-ray-induced photoreduction of a static AxNiR crystal using 1.37 Å X-rays. (a) Spectra collected at 30 s intervals showing the progressive reduction in the height of the 595 nm peak associated with conversion of T1Cu(II) to T1Cu(I). The first 20 spectra and the final spectrum are plotted. (b) The dependence of the 595 nm peak height on absorbed X-ray dose. The time points indicative of MX and XAS data collection are shown.