Simulation of High Resolution Electron Microscope Images of a Wedge-Shaped Crystal, MgO

A new algorithm to simulate a high resolution electron microscope image of a wedge-shaped crystal is developed. The image of the crystal whose thickness continuously varies is calculated in one lump. This algorithm consists of two parts. One is to calculate the wave function on the exit surface of the crystal with the multi-slice method for inclined incidence and the other is to transfer the wave function onto a certain plane perpendicular to the optical axis. This new method is applied to images of small MgO cubic crystals observed from the [110] direction by 400 kV and 200 kV high resolution electron microscopes. It is shown that the simulated images can well represent actual images. Key words = image simulation: wedge-shaped crystal: inclined illuminatio