孪晶 02645A Twin SE 5um
• 孪晶 ·
·纳米金颗粒 40nm 纳米管
• 纳米金颗粒 纳米管
Imaging atom columns/lattice planes Go to a zone axis orientation Low index zone axis is preferred ·eg.[110],[001]or[111]for fcc It is because of the resolution limit of the EMs. 8
Imaging atom columns/lattice planes • Go to a zone axis orientation • Low index zone axis is preferred • eg. [110], [001] or [111] for fcc • It is because of the resolution limit of the EMs. 8
Imaging using more than one beam ●透射波 ·衍射波 (a) (b) (c) Bright field Dark field HREM Amplitude contrast 9
Imaging using more than one beam 9 Bright field Dark field HREM Amplitude contrast
衍射衬度和相位衬度 试样 28 20 物镜 物镜光阑 后焦平面 像平面 (a)散射吸收衬度 (b)相位衬度 (振幅衬度)
衍射衬度和相位衬度 • Yi