view article
Figure 8
Measured (a) reflected terrace intensity and (b) step contrast as a function of sample angle, δα, for the condenser focus position on the sample (black circles) and 9 mm downstream (red squares). The data points are derived from the least-squares fitting of the intensity line scans (e.g. Fig. 3[link]) using one or two Gaussian peaks and a linear background. The solid line in (a) is a Gaussian function with a full width at half-maximum of 0.04°. Multiple data points at each sample angle correspond to independent points on the same image and the differences are due to non-uniform illumination. Note how the contrast variation is asymmetric with respect to the incident angle. The blue line is derived from the model calculations with an X-ray optical resolution of 100 nm (or ∼4200 nm projected onto the surface plane) and an assumed maximum contrast of 0.1.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 15| Part 6| October 2008| Pages 558-571
doi:10.1107/S0909049508023935
Follow J. Synchrotron Rad.
Sign up for e-alerts
E-alerts
Follow J. Synchrotron Rad. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS