Curved Crystal Microfocus X-ray Monochromator

该提案要求为弯曲晶体微焦点单色仪提供资金，该单色仪将取代我们布鲁克Smart Apex 2钼衍射仪的标准平面石墨单色仪。升级将在晶体上提供X射线“热点”，导致非常小的单晶衍射强度高达7倍，使研究人员能够从小到约100微米的样品中确定分子和固态结构。0.000004 mm3。申请人一直在推动化学X射线实验室中可以实现的极限。现有的仪器和样品制备技术已被配置为解决广泛的挑战性问题。X射线源的亮度增加将允许申请人获得对于他的大百分比的空气和热敏化合物（其有时是侵蚀性氧化剂）先前无法获得的分子结构，并且允许申请人在更短的时间内和更经济地产生更精确的结构模型。除了提供更多更好质量的分子结构外，此次升级还将允许申请人和McMaster X射线设备（MAX）的其他用户获得高分辨率衍射数据，包括详细的漫散射和无公度散射。这些散射特征将允许对短程结构修改和相的共生进行建模，这两个因素可以极大地改变材料的物理性质。MAX设施的任务之一是对研究生，博士后研究员和教师进行使用衍射方法解决结构问题的实践培训。研究生水平的课程提供单晶和粉末衍射技术的理论和实践，课程项目通常会导致出版物。因此，新的应用程序和能力不断被开发和传播的MAX设施。一个最先进的微焦点X射线源，它赋予现有的钼衍射仪的增强能力，也将提供最新的X射线晶体学培训。同样的升级最近出现在加拿大的实验室中，并已被证明是一项值得的投资。

This Proposal requests funding for a curved crystal microfocus monochromator which will replace the standard flat graphite monochromator of our Bruker Smart Apex 2 Molybdenum diffractometer. The upgrade will provide an X-ray "hot spot" at the crystal, resulting in up to 7 times the diffracted intensity from very small single crystals, allowing researchers to determine molecular and solid-state structures from samples as small as ca. 0.000004 mm3. The Applicant has consistently pushed the limits of what can be achieved in a chemistry X-ray laboratory. The existing instrumentation and sample preparation techniques have been configured to tackle a wide range of challenging problems. The increased brilliance of the X-ray source will allow the Applicant to obtain molecular structures that were previously unattainable for a large percentage of his air- and thermally sensitive compounds which are, sometime, aggressive oxidizers, and to produce more precise structural models in less time and more economically. In addition to providing access to more and better quality molecular structures, this upgrade will also permit the Applicant and other users of the McMaster X-ray facility (MAX) to obtain high-resolution diffraction data, including detailed diffuse and incommensurate scattering. These scattering features will allow the modeling of short range structural modifications and intergrowth of phases, two factors which can drastically alter the physical properties of materials. One of the mandates of the MAX facility is the hands-on training of graduate students, postdoctoral fellows, and faculty in the use of diffraction methods to solve structural problems. Graduate level courses are offered in the theory and practice of single-crystal and powder diffraction techniques, and course projects generally result in publications. Consequently, new applications and capabilities are constantly being developed and disseminated from the MAX Facility. A state-of-the art microfocus X-ray source with the enhanced capabilities it imparts to the existing Mo diffractometer would also provide training in X-ray crystallography that is up-to-date. The identical upgrade has recently appeared in labs in Canada and has proven to be a worthwhile investment.