Hi all I've been looking at atomic scattering factors recently, and in particular, the 11-coefficient parameterisation by Waasmaier and Kirfel [1].
In their paper, they give a parameterisation for O and O-, but in tables I can find online (eg libdiffpy/f0_WaasKirf.dat at master · diffpy/libdiffpy (github.com) <https://github.com/diffpy/libdiffpy/blob/master/src/runtime/f0_WaasKirf.dat>), there is also an entry for O2-. Does anybody know where this came from? Thanks Matthew [1] D. Waasmaier & A. Kirfel, New Analytical Scattering Factor Functions for Free Atoms and Ions for Free Atoms and Ions, Acta Cryst. (1995). A51, 416-413
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