Figure 5
As fluorescence signals (closed circles), specular fluxes (open circles) and diffracted fluxes (crosses) observed from an As/Si(001) sample in grazing-angle diffraction for (a) 220, (b) and (c) 040 reflections in ultrahigh vacuum. Average As emission counts in 500 s are 650 in (a), 500 in (b) and 1400 in (c). The glancing-incidence angles used are indicated (φ0). Lines show least-squares fits. |