Krakow W
IBM, T.J. Watson Research Center, Yorktown Heights, New York 10598.
J Electron Microsc Tech. 1991 Jul;18(3):277-90. doi: 10.1002/jemt.1060180310.
A new method has been developed for simulating high resolution electron microscope images of weak phase objects via a digital television frame store system and fast Fourier transforms of a graphical representation of structures containing several atomic species. Here masks are constructed which consist of circular disk regions whose areas are proportional to the scattering power of the different atom types. These masks represent the object transmission function. The method extends the previous work on image computations of monatomic species objects using small point-like model representations of atom positions. Several examples will be given to verify the relative scattering power from masks corresponding to different atomic species such as Y, Ba, Cu, and O, as well as the limitations of this method for representing objects. Image simulations, which are in agreement with experiments, will also be presented for superconducting oxide materials of the form YBa2Cu3O7 using the circular disk method.
已开发出一种新方法，通过数字电视帧存储系统以及对包含几种原子种类的结构的图形表示进行快速傅里叶变换，来模拟弱相位物体的高分辨率电子显微镜图像。在此构建的掩模由圆盘区域组成，其面积与不同原子类型的散射能力成正比。这些掩模代表物体的透射函数。该方法扩展了先前使用原子位置的小的点状模型表示对单原子种类物体进行图像计算的工作。将给出几个例子来验证对应于不同原子种类（如Y、Ba、Cu和O）的掩模的相对散射能力，以及该方法在表示物体方面的局限性。还将使用圆盘法给出与实验相符的YBa2Cu3O7形式的超导氧化物材料的图像模拟。
