MRI: Acquisition of a Multiple Collector ICPMS for Geochemical and Cosmochemical Studies at DTM

0820771卡尔森主要研究仪器（MRI）计划拨款的资金将用于支持华盛顿卡内基研究所（CIW）购买多集电极电感耦合等离子体质谱仪（MC-ICP-MS）和激光消融（LA）微探针。 该仪器将增强并最终取代10年前在NSF-MRI-MS计划的支持下购买的两台现有的第一代MC-ICP-MS仪器。 制造商不再支持这些仪器。 与CIW现有的第一代仪器相比，最先进的MC-ICP-MS和193 nm LA微探针将使质量检测灵敏度、质量分级稳定性、检测器准确性、可靠性和易用性得到实质性改善。 新的LA-MC-ICP-MS将支持一系列宇宙和地球化学研究，这些研究需要对碱金属、过渡金属、铂族（PGE）和稀土元素的同位素比进行微空间分辨的高精度分析。 MC-ICP-MS还将允许使用最新的等离子体质谱技术继续卡内基同位素地球化学博士后项目。 具体的研究领域，将促进与新的仪器将包括调查：1）在早期太阳星云的化学和同位素的不均匀性程度及其对类地行星的大部分组成的影响; 2）的时间，金属硅酸盐分馏的星子和金属硅酸盐平衡的程度在地球形成？的核心; 3）Re-Os同位素和PGE丰度变化记录了地幔分异与大陆形成的历史和过程; 4）造成地幔成分不均一性的过程。

0820771CarlsonFunds from this Major Research Instrumentation (MRI) Program grant will support acquisition of a multicollector inductively-coupled plasma mass spectrometer (MC-ICP-MS) and laser ablation (LA) microprobe at the Carnegie Institution of Washington (CIW). The instrument will augment and ultimately supplant two existing first generation MC-ICP-MS instruments purchased 10 years ago with support from the NSF-MRI-EAR program. These instruments are no longer supported by the manufacturer. A state-of-the-art MC-ICP-MS and a 193 nm LA microprobe will allow for substantial improvements in mass detection sensitivity, mass fractionation stability, detector accuracy, reliability, and ease of use compared to existing first generation instruments at CIW. A new LA-MC-ICP-MS would support a range of research in cosmo- and geochemistry requiring microspatially resolved high precision analyses of isotope ratios of alkali metals, transition metals, Platinum group (PGE) and rare earth elements. The MC-ICP-MS will also allow for continuation of the Carnegie isotope geochemistry postdoctoral program using the latest plasma mass spectrometry techniques. Specific research areas that will be fostered with the new instrument will include investigations of: 1) the degree of chemical and isotopic heterogeneity in the early solar nebula and its influence on the bulk composition of the terrestrial planets; 2) the timing of metal-silicate fractionation on planetesimals and the degree of metal-silicate equilibrium during formation of Earth?s core; 3) Re-Os isotopic and PGE abundance variations as recorders of the history and processes of mantle differentiation in relation to continent formation; and 4) processes that create compositional heterogeneity in the mantle.***