Before starting to talk about HREM,a couple of things to be clarified What are we looking at in HREM? ·How can we look? Why are contrast generated? 2D Silica Glass Unit Amorphous Sheet Top Side 1 nm Science 11 October 2013:Vol.342 no.6155 pp.224-227 DOI:10.1126/science.1242248Before starting to talk about HREM, a couple of things to be clarified • What are we looking at in HREM? • How can we look? • Why are contrast generated? 4 Science 11 October 2013: Vol. 342 no. 6155 pp. 224-227 DOI: 10.1126/science.1242248 2D Silica Glass