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Experimental system. (A) Structure of LPS Re from the strain R595 of Salmonella enterica sv. Minnesota. C and P denote carboxyl and phosphate groups, respectively. (B) Sketch of the setup used for GIXF measurements at the air/water interface. Fluorescence radiation from the ions was recorded with an energy sensitive detector at various angles of incidence αi below and above the critical angle for total reflection αC.
