Figure 3
Diffraction patterns of thaumatin within the vacuum chamber; the inset in each pattern shows an enlarged area of the diffraction at an approximate resolution range of 6.4–3.7 Å. (a, b) Images 1 and 485, respectively, of crystals of thaumatin wrapped in graphene/PMMA within the chamber in air at atmospheric pressure. (c, d) Images 1 and 485, respectively, of crystals of thaumatin wrapped in graphene/PMMA within the vacuum chamber under vacuum. (e, f) Images 1 and 485, respectively, of crystals of thaumatin within the vacuum chamber under vacuum. All images are displayed with the same contrast levels; (a) and (b) use a 90 × 45 µm aperture to select the beam size, whereas images (c), (d), (e) and (f) use a 20 × 20 µm aperture to define the beam size. Owing to these differences in the setup, as well as the air path between the scatter guard and the entrance window and between the exit window and the beamstop, too much cannot be drawn from the differences in the background scatter. It can be seen, however, that when graphene/PMMA is present around the crystals and they are exposed to vacuum, diffraction remains until the end of data collection when compared with the data collection when the crystals are under vacuum but are not protected by graphene/PMMA. |