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Figure 1
Rowland circle geometry. The incident beam is scattered by the sample (1), then analyzed by the spherically bent analyzer (2) with a radius which is twice that of the Rowland circle and detected by the detector (3). In the Johann geometry only one point of the analyzer is on the Rowland circle, giving rise to astigmatism and a contribution to the total resolution.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 4| July 2005| Pages 473-478
https://doi.org/10.1107/S090904950501472X
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