Acquisition of a New Generation Thermal Ionization Mass Spectrometer

Sharma部分资金用于购买新一代多收集器热电离质谱仪（TIMS），该质谱仪可以对带正电和带负电的离子束进行超高精度测量。 达特茅斯学院将提供一个匹配的仪器的预期成本的50%组成。 TIMS仪器将成为地球科学系新的放射性同位素地球化学实验室的主要研究工具。超高精度的锇和钕同位素比率将使用新的TIMS确定，目的是解决与地球和其他行星储层的起源和演变有关的问题。此外，还将对铯、锇、铱、钐、钕、铀、钍、铅、铷、锶和铁同位素进行高灵敏度测量。新的TIMS设施将为达特茅斯的研究提供一个令人兴奋的新维度，补充地球科学系现有的强大研究项目，包括K-Ar地质年代学，有机地球化学和古海洋学，流域水文地球化学，气候变化，景观演变，地层学和盆地分析，水文学和地质力学以及构造学。其中许多项目都有放射性同位素组成部分，需要使用最先进的TIMS设施。此外，达特茅斯和新英格兰地区的其他研究人员和学生将能够使用新设施，从而进一步促进地球化学和物理科学的研究和教育。

EAR-0130631SharmaPartial funding is awarded towards the purchase of a new generation multi-collector Thermal Ionization Mass Spectrometer (TIMS), which permits ultra-high precision measurements of positively and negatively charged ion beams. The Dartmouth College will provide a match consisting of 50% of the expected cost of the instrument. The TIMS instrument will be the primary research tool in the new radiogenic isotope geochemistry laboratory in the Department of Earth Sciences. Ultra-high precision osmium and neodymium isotopic ratios will be determined using the new TIMS with the aim of addressing issues related to the origin and evolution of Earth and other planetary reservoirs. In addition, high sensitivity measurements of rhenium, osmium, iridium, samarium, neodymium, uranium, thorium, lead, rubidium, strontium, and iron isotopes will be performed. The new TIMS facility will provide an exciting new dimension to research at Dartmouth, complementing the extant strong research programs in the Department of Earth Sciences, which include K-Ar geochronology, organic geochemistry and paleoceanography, hydrogeochemistry of watersheds, climate change, landscape evolution, stratigraphy and basin analysis, hydrology and geomechanics, and tectonics. Many of these programs have a radiogenic isotope component and require access to a state-of-the-art TIMS facility. Additionally, other researchers and students at Dartmouth and in New England region will be able to use the new facility, resulting in further growth of research and education in geochemistry and in physical sciences.