Figure 43

Fig. 43: Rocking scan around the surface normal from a Pt(111) crystal face at the minimum of a crystal truncation rod. The crystal was at room temperature and at an ambient pressure of 0.33 bar of CO. The peak counting rate is 222 kcounts/s over a background measured at the long tails of the scan of 2.5 kcounts/s. The full with at half maximum of 0.057° is indicative of the large (~200 nm) surface terraces.