Figure 3
Energy scans at fixed momentum-transfers Qz (as indicated by arrows in Fig. 1) near the Cs LIII-edge of a DHDP monolayer spread on 10−3 M CsI solution (π = 40 mN m−1). Solid lines are best fits to the data as described in the text (energy scan at Qz = 0.35 Å−1 is offset vertically, by +0.2, for clarification). Energy scans of the CsI solution surface (10−3 M) at Qz = 0.15 Å−1 (triangles) do not detect any anomalies in the absence of interfacial charges, i.e. with no monolayer. |