主题：在CCD上拍电子衍射照片时，如何将标尺转换成电子衍射的那种标尺？

DM的版本是什么？我的是3.3.4的好像。
需要先拍一张标准样品的衍射才行。

原文由 shxie 发表:
DM的版本是什么？我的是3.3.4的好像。
需要先拍一张标准样品的衍射才行。

我们的DM是3.9.0的。

如何拍标准样品的衍射呢？

应该有个选项可选的，是拍图像还是拍衍射，不过我没有这个高版本的软件，只是听gatan的报告里讲过，具体应该说明书里有介绍的吧。

我的低版本的是通过DIFFPACK的插件实现的，Pan Ming老师给过一个流程：
Up until now, DM software does not support camera length for diffraction work. This means that all the diffraction patterns recorded by the CCD cameras will have real space dimension such as nm. There is a way to calibrate any single diffraction pattern by using the ROI line tool (the dotted line in the ROI tool palette). Use the ROI line tool and draw from either the central spot to any known diffraction spot (g) or from -g to +g. Then under the menu "Analysis" choose "Calibrate...". In the dialog box, first make sure to check the correct unit on the right hand side, i.e. 1/nm, or 1/A, then on the left side box, enter the real space distance for the distance you draw in the diffraction pattern. For example, if you draw the diameter of the first ring in a gold diffraction pattern, you need to choose 1/nm unit and then enter 0.115nm (1/2 of 0.23nm for Au(111)). This way you just calibrate this diffraction pattern. However, for next pattern you have to do the same thing. But if next pattern is from a unknown phase, this does not work as you do not know any of the spacing in the pattern.
The best way is to use DIFPACK to calibrate the diffraction standard. If you record all your diffraction patterns under same camera length and you also recorded a standard diffraction pattern under the same camera length. First open the standard pattern and use the Calibration tool to calibrate this pattern. Then under DIFPACK/Images/Transfer Calibration (as shown below).


Then choose the source image and destination image (the image that contain diffraction spots you want to measure). You must open the destination image before doing the transfer.
This way, you can transfer the calibration to all the diffraction patterns recorded under identical camera length and be able to measure the diffraction spots.

后来他提到一句：
The upcoming GMS 1.3 release will add camera length support. So camera length will be treated the same way as magnification. Then you will be directly read off the correct value for diffraction patterns (since diffraction patterns will have correct unit such as 1/nm).

谁用过DM是3.9.0的？如何改变成电子衍射标尺，请谈一谈。谢谢！

都没用过DM3.9.0版吗？