论文标题
使用一阶Laue区电子衍射的方位角变化来测量原子调制方向
Measurement of atomic modulation direction using the azimuthal variation of first order Laue zone electron diffraction
论文作者
论文摘要
我们表明，晶体的一阶Laue区（FOLZ）的衍射强度可以具有强大的方位角依赖性，在该依赖性依赖性中，该FOLZ环仅是由于单向原子位置调制而出现的。已知这种调节已经在原子分辨率图像中引起椭圆形的出现，但是我们表明，通过4维扫描透射透射电子显微镜（4DSTEM）测量角度的测量更为可靠，并且可以测量调制方向的精度约为1°，并且精度约为3°。该方法在3个维度在4DStem中表征原子结构时可能非常强大，尤其是在结构偏离大量晶体中的原子结构。
We show that diffraction intensity into the First Order Laue Zone (FOLZ) of a crystal can have a strong azimuthal dependence, where this FOLZ ring appears solely because of unidirectional atom position modulation. Such a modulation was already known to cause the appearance of elliptical columns in atom resolution images, but we show that measurement of the angle via 4-dimensional Scanning Transmission Electron Microscopy (4DSTEM) is far more reliable and allows the measurement of the modulation direction with a precision of about 1° and an accuracy of about 3°. This method could be very powerful in characterising atomic structures in 3 dimensions by 4DSTEM, especially in cases where the structure deviates from that found in bulk crystals.
