MRI: Acquisition of a Multi-collection Detector System for the Cameca IMS 1280 in the Northeast National Ion Microprobe Facility

MRI：为东北国家离子微探针设施的 Cameca IMS 1280 购买多采集探测器系统

• 批准号: 2216262
• 负责人: Glenn Gaetani
• 金额: $ 99.97万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2216262&HistoricalAwards=false
• 关键词: MRI; Acquisition; Multi; collection; Detector

This Major Research Instrumentation (MRI) Program award provides funds to upgrade the Cameca IMS 1280 ion microprobe operated by the Northeast National Ion Microprobe Facility (NENIMF) with a multi-collection detector. Secondary ion mass spectrometry (SIMS) is a powerful micro-analytical technique for determining the elemental and isotopic compositions of solid materials that has broad applications to earth, ocean, and planetary sciences. The NENIMF has operated as a highly productive, NSF-supported National Facility for twenty-six years and is equipped with instrumentation and personnel that are ideally suited to help the geoscience community take full advantage of multi-collector SIMS. An IMS 1280 upgraded with multi-collection capability would complete the NENIMF as a cutting-edge SIMS facility serving the US geoscience community for a fraction of the cost of purchasing a new Cameca IMS 1300-HR3 (~$7 million). The mono-collection NENIMF IMS 1280 has established an important niche in the geoscience community as a major source of high-quality data on volatile element concentrations in silicate glasses, glass inclusions, and nominally anhydrous minerals. The upgrade to multi-collection will be leveraged by combining this existing expertise with the capability to analyze light stable isotopes on the same spots and, thereby, allow us to provide exciting and innovative new SIMS applications for users of the facility. The proposed upgrade would greatly enhance studies of pre-eruptive magmatic volatiles, which represent an important control on volcano explosivity, as well as volatiles (especially sulfur) in the solid Earth, cosmochemistry, oxygen isotope thermometry, biogenic carbonates, and biogeochemistry.The Cameca IMS 1280 is a double focusing mass spectrometer with a large radius magnetic sector, and ion optics optimized to attain a mass resolving power of 6000 without significant loss of secondary ion intensity. Starting in 1998, an increasing number of IMS 1270/1280 ion microprobes have been equipped with the capability to measure up to five isotopes simultaneously (multi-collection). Multi-collection has a number of significant advantages over mono-collection. First, it increases the efficiency of data collection and – thereby – minimizes the effect of instrumental drift. For example, the time required to determine the isotopic composition of S in sulfides or O in silicates is decreased from approximately 12 minutes per spot using mono-collection to only 4 minutes per spot by multi-collection. This leads to significant improvements in accuracy and reproducibility because instrumental drift can be corrected for through a much higher frequency of standard analyses between samples. Second, the ability to measure multiple isotopes simultaneously leads to a significant increase in data quality by minimizing the effects of instability and drift of the primary ion beam. For example, the 32S/34S measurements on sulfide standards on the NENIMF mono-collection system have a typical precision of 0.07-0.12 ‰ 2RSE (relative standard error) and a spot to spot reproducibility (accuracy) of ~0.6 ‰ 2RSD (relative standard deviation). Multi-collector analysis on the same standards have a precision of 0.02-0.03 ‰ 2RSE and accuracy 0.1 ‰ 2RSD. Third – and most importantly – multi-collection allows for high-precision in situ analysis of stable isotopes of light elements such as H, C, O, S, and Cl.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项主要的研究工具（MRI）计划奖提供了资金，以升级由东北国家离子微探针设施（Nenimf）使用多收集探测器操作的Cameca IMS 1280离子微型探针。次级离子质谱法（SIMS）是一种强大的微分析技术，用于确定固体材料的元素和同位素组成，对地球，海洋和行星科学具有广泛应用。 Nenimf已作为高产，由NSF支持的国家设施运行了二十六年，并配备了仪器和人员，非常适合帮助地球科学社区充分利用Multi-Collector Sims。 IMS 1280升级了多收集能力，将完成Nenimf，作为一个为美国地球科学社区提供服务的尖端SIMS设施，购买了新的Cameca IMS 1300-HR3（约700万美元）的成本的一小部分。单收集Nenimf IMS 1280在地球科学界建立了一个重要的利基市场，是硅胶玻璃，玻璃夹杂物和名义上无水矿物质中挥发性元素浓度的高质量数据的主要来源。通过将这种现有专业知识与分析同一景点上的轻稳定同位素相结合，从而允许我们为设施用户提供令人兴奋且创新的新SIMS应用程序的能力，可以利用对多收集的升级。拟议的升级将大力增强对爆发前磁性波动的研究，这代表了对火山爆炸性的重要控制，以及在固体地球，稳态，体化学，氧气同位素温度测定，生物源性碳酸盐，生物源性碳酸盐和生物地质学方面的挥发性（尤其是硫）的优化范围，具有双重光谱的范围。达到6000的质量分辨能力，而没有明显的次级离子强度损失。从1998年开始，越来越多的IMS 1270/1280离子微探针等效于最多可简单地测量五个同位素（多收集）。多收集比单收集具有许多重要的优势。首先，它提高了数据收集的效率，从而最大程度地减少了仪器漂移的效果。例如，确定硫化物中S或O中S的同位素组成所需的时间从使用单收获的每点大约12分钟减少到每点仅4分钟，而多收获。这会导致准确性和可重复性的显着提高，因为可以通过样品之间的标准分析频率更高的频率来纠正仪器漂移。其次，测量多种同位素的能力类似地通过最大程度地减少原代离子束的不稳定性和漂移的影响，从而显着增加数据质量。例如，NENIMF单聚集系统上硫化物标准的32S/34S测量值的典型精度为0.07-0.12‰2RSE（相对标准误差）和一个斑点可重复性（精度）〜0.6‰2RSD（相对标准偏差）。相同标准的多策略分析的精度为0.02-0.03‰2RSE，准确性为0.1‰2RSD。第三（也是最重要的是 - 多收获允许对稳定的光元素（例如H，C，O，S和CL）的稳定同位素进行高精度分析。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛影响的审查标准来评估来通过评估来获得的支持。