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Figure 6
(a) Image of the LEED pattern of a (7 × 7) reconstructed Si(111) surface. The kinetic energy of the electrons was set to 29.4 eV. The LEED-image intensity has been logarithmically rescaled. The two outer arrows, along the elongated red box, indicate the (00) elastic reflected beam and the (10) first-order diffraction spot. The other arrows in between are distributed at integer multiples of a seventh of the (00)–(10) distance. The red arrow in the bottom-left highlights the detector region with a thinned entrance-window as discussed in §3.2[link]. (b) Logarithmic plot of the line profile across the long axis of the elongated red box as shown in (a). The black arrows mark the same positions as in (a). The bottom-right of the plot, for counts below 10, is expanded in the linear plot in the inset. Notice that the line profile outside of the Ewald's sphere eventually drops to zero counts.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 5| September 2017| Pages 963-974
https://doi.org/10.1107/S1600577517009109
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