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Modification of Cryogenic System of X-ray Single Crystal Diffractometer XtaLAB Pro
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摘要: X-射线单晶衍射作为一种可以精确测定分子三维空间结构的物理方式，是现代化学研究中重要的技术手段之一，广泛应用于生物、化学等领域. 低温系统是X-射线单晶衍射仪中重要的配件系统，晶体在低温液氮条件下测试，能够避免风化和开裂，同时减少晶体中原子的热运动，从而得到更好的测试数据. 改造了一款X-射线单晶衍射仪XtaLAB Pro的低温系统，实现了实时监测杜瓦瓶内液氮液位高度、液氮自动补给以及远程报警功能，减少频繁手动添加液氮的麻烦，提升效率，节省时间与成本.Abstract:
X-ray single crystal diffractometer is a physical method that can accurately determine the three-dimensional structure of molecules. It is one of the important technical means in modern chemical research and is widely used in biology, chemistry and other fields. The cryogenic system is an important accessory system in the X-ray single crystal diffractometer. Crystals tested under low-temperature liquid nitrogen conditions can avoid the weathering and cracking, and reduce the thermal movement of atoms in the crystal, thus better test data are obtained. The cryogenic system of XtaLAB Pro, an X-ray single crystal diffractomete was modified to realize the real-time monitoring of liquid nitrogen in the Dewar flask, the automatic rehydration and the remote alarm, which reduce the frequently manual addition of liquid nitrogen, improve the efficiency, save time and cost. -
图 1 （a）低温系统改造后示意图，（b）图(a)中蓝色框部分的尺寸和具体构造
Figure 1. (a) Diagram of modification of cryogenic system, (b) size and construction of blue section in figure (a)
图 2 相关测试情况
（a）杜瓦瓶内液氮实时液位，（b）设置自动补液高度与停止补液高度，（c）法兰实物图，无需打开法兰即可添加液氮，（d）远程报警短信
Figure 2. Results of relevant test
(a) liquid level of liquid nitrogen in Dewar vessel, (b) set automatic fluid replenishment height and stop fluid replenishment height, (c) physical design of flange cover, no need to open flange cover to add liquid nitrogen, (d) remote alarm message
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