Acquisition of a cathodoluminescence detector to increase imaging capability of existing SEM facility, Department of Geoscience, University of Iowa

10386884 mcclelland这笔拨款用于购置一台阴极发光（CL）光谱仪，该光谱仪将与爱荷华大学地球科学系现有的变压扫描电子显微镜（SEM）相匹配。CL成像将支持矿物生长历史的研究，允许可视化和绘制晶体带和微观结构特征。使用SEM的CL扫描将支持随后使用其他电子显微镜技术、二次离子质谱或激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）对不同生长环进行靶向元素分析和/或同位素分析。该仪器将补充最近NSF MRI支持的地球科学系的激光烧蚀ICP-MS设备，用于锆石年代学和矿物中微量元素的分带，并支持一系列火成岩和变质岩石学研究，冲击过程，以及碎屑沉积和碳酸盐相分析，以阐明沉积时的环境条件。CL显微镜将支持学生在校园多个部门的研究培训，pi试图通过现有的研究生教育和教授联盟（AGEP）计划和NASA教育补助金来吸引代表性不足的学生，旨在鼓励本科女性追求科学事业。该仪器还将支持与附近的康奈尔学院（Cornell College）的教职员工和学生的合作研究。康奈尔学院是一所地区性文理学院。＊＊＊

1038684McClellandThis grant supports acquisition of a cathodoluminescence (CL) spectrometer which will be mated to an existing variable pressure scanning electron microscope (SEM) in the Department of Geosciences at the University of Iowa. CL imaging will support studies of mineral growth history by allowing for visualization and mapping of crystal zoning and microstructural characteristics. CL scanning using an SEM will support subsequent targeted elemental analysis and/or isotopic analysis of distinct growth rims using other electron microscopy techniques, secondary ion mass spectrometery or laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The instrument will complement a recently NSF MRI supported laser ablation ICP-MS facility in the Department of Geoscience for zircon geochronology and trace element zonation in minerals and support a range of research in igneous and metamorphic petrology, impact processes, and analysis of clastic sedimentary and carbonate phases to elucidate the environmental conditions at the time of their deposition. The CL microscope will support student research training across multiple departments on campus and the PIs seek to attract underrepresented students through an extant Alliance for Graduate Education and Professoriate (AGEP) program and a NASA Education grant targeted at encouraging undergraduate women to pursue science careers. The instrument will also support collaborative research with faculty and students from nearby Cornell College, a regional liberal arts institution. ***