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Figure 5
The spectra measured at a fixed exit angle αf in the far-fields of the short (a) and long (b) waveguide show characteristic oscillations that are equidistantly spaced in E−1. This spacing decreases with an increasing waveguide length. A local maximum in the spectrum corresponds to an energy for which the maximum of the far-field diffraction pattern appears at αf > 0, while local minima in the spectrum correspond to energies for which the maximum of the far-field diffraction pattern appears at αf < 0. As indicated by the dashed lines, the measurements yield periods of ΔE−1 = 7.48 × 10−3 keV−1 (a) and ΔE−1 = 3.22 × 10−3 keV−1 (b), respectively.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 13| Part 1| December 2006| Pages 69-73
doi:10.1107/S0909049505038008
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