Extended Data Fig. 2: Qualities of rotation center alignment with and without Au position marker.
From: Ultrahigh-pressure crystallographic passage towards metallic hydrogen
(a) Micro-image of H2 sealed in MgO-epoxy insert gasket without Au position marker. (b) Rotation center alignment by scanning MgO (2 0 0) peak at three different angles. Position with no MgO peak is where H2 is located. Dash lines mark the center positions of H2 at different angles. (c) and (d) show micro-images of H2 sealed in MgO-epoxy insert gasket with Au position marker with transmitted light and reflected light illumination, respectively. A piece of 2 to 3 μm Au was loaded nearby H2 sample. (e) Rotation center alignment by scanning Au (1 1 1) Bragg peak at three different angles. Dash lines mark the center positions of Au at different angles. With Au position marker, the precision of rotation center alignment is substantially improved.
