Figure 11
Experimentally obtained photon flux curves. Photon flux curves were measured with ID gap and grating scanned at fixed included angles (i.e. M2 mirror was fixed). Photon flux curves for linearly horizontally (LH) and linearly vertically (LV) polarized light are included. Note that four horizontal or four vertical ID segments are enabled for LH and LV polarizations, respectively. The grating was 600 lines mm−1 (G600). The opening of the front-end slit was 2.0 mm × 1.75 mm (height × width). The opening of the exit slit was 20 µm. Energy resolution measurements confirmed that the energy resolving power at photon energies of 250, 400, 540 and 640 eV exceeded 10000. The dip in the photon flux around 285 eV is due to carbon contamination of the optics (mirrors and grating). |