Figure 7
Beamline focus at the position of the sample in the reflectometer chamber (a) at standard beamline settings [500 eV, cff = 2.25, exit slit 100 µm, acceptance 0.56 mrad × 0.85 mrad (v × h)] and (b) at a reduced beamline acceptance of 0.28 mrad × 0.28 mrad and an exit slit of 30 µm. The focus size is 380 µm × 185 µm and 140 µm × 80 µm, respectively |