A Focusing Weissenberg Camera with Multi-Layer-Line Screens for Macromolecular Crystallography
A Focusing Weissenberg Camera with Multi-Layer-Line Screens for Macromolecular Crystallography
复制标题
用于高分子晶体学的具有多层线屏幕的聚焦韦森伯格相机
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
N. Sakabe
中科院分区：
文献类型：
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作者：
N. Sakabe
传统的Weissenberg相机[Weissenberg(1924)。Z.Phys.23,229-238]已针对大分子结晶学进行了修改。该摄像系统由双弯LiF单色仪、新设计的多层线屏韦森伯格测角仪及其控制器组成。该相机用于在高信噪比的胶片上记录来自大晶胞尺寸的晶体的许多高分辨率反射，而不会损失屏幕上的任何衍射束。由此产生的照片非常容易索引，与摆动相机相比，部分记录的反射与完全记录的反射的比率降低。多层线屏幕特别适用于连续的X射线束，例如同步辐射，其中波长和带通都可以适当地选择。介绍了用LiF单晶制备点聚焦单色仪的方法，并讨论了反常色散曲线的记录。
A conventional Weissenberg camera [Weissenberg (1924). Z. Phys. 23, 229–238] has been modified for macromolecular crystallography. This camera system consists of a doubly bent LiF monochromator, a newly designed Weissenberg goniometer with multi-layer-line screens and its controller. The camera is useful for recording many reflections up to high resolution on a film with high signal-to-background ratio from a crystal with large unit-cell dimensions without losing any of the diffracted beams by screens. The resulting photograph is very easy to index, and the ratio of partially recorded reflections to fully recorded reflections decreases in comparison with an oscillation camera. The multi-layer-line screens are especially practical with a continuous X-ray beam such as synchrotron radiation where both wavelength and band pass can be selected properly. The preparation of a point-focusing monochromator from a single-crystal of LiF is described, and the recording of anomalous dispersion profiles is discussed.