Synchrotron X-radiation protein crystallography: CEA film absorption factor as a function of wavelength 0.3≤λ≤2Å

The film absorption factors for CEA Reflex 25 X-ray film have been estimated by three different methods as a function of wavelength in the range 0.3 ≤ λ ≤ 2 Å. This wavelength range encompasses many absorption edges of interest in X-ray crystallography to optimize anomalous dispersion, those wavelengths used to reduce protein crystal absorption (λ ≤ 1 Å), and the spectral range utilized for protein crystal Laue diffraction at synchrotron radiation sources. The value of the film factor at a given λ is important to many protein structural projects.