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Figure 1
Schematic illustration of conventional normalization (a–c) and MBACK normalization (d–f). (a) Measured data (black) are first fitted by a pre-edge polynomial (green) which is then extrapolated over the data range. The vertical line marks the end of the pre-edge fit region. (b) A post-edge spline (red) is then fitted to the pre-edge subtracted data (black) and extrapolated to E0 (vertical line) in order to determine the appropriate scale factor. (c) Conventionally normalized data. (d) In the MBACK procedure, a single background function (red), consisting of a complementary error function (green) plus a polynomial (pink), is used to fit the data both below and above the edge in order to maximize the agreement with the corresponding region of tabulated X-ray cross section, shown in (e). The vertical lines in (d) and (e) mark the edge region that is excluded from the fit. (f) MBACK normalized spectrum.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 4| July 2005| Pages 506-510
https://doi.org/10.1107/S0909049504034193
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