Diamond Light Source Photographic Exhibition

32 33 In a crystalline material atoms are arranged in an ordered regimental structure. The physical properties of the material can be dramatically altered by creating very small deviations away from this ideal structure. This image shows at atomic resolution a scanning electron microscope image of a two atom thick material, molybdenum disulphide, which was recorded at Diamond’s ePSIC (electron Physical Science Imaging Centre). The bright dots are the individual atoms that make up the crystal. Numerous defects have been deliberately created in the material by chemically removing some of the sulphur atoms to investigate the outcome, these defect sites can be seen as missing bright spots in the image. The very bright dot in the centre of the image is a platinum atom which has been incorporated into the material taking the place of a sulphur atom. (Image: Christopher Allen) An image taken using the Photoemission Electron Microscope (PEEM) on beamline I06. The image shows the ferroelectric domains in a sample of barium titanate, BaTiO3 (BTO). (Image: I06)