Collaborative Research: Improving and calibrating a Tunable Infrared Laser Direct Absorption Spectroscopy (TILDAS) system for clumped isotope analysis of CO2

合作研究：改进和校准用于 CO2 聚集同位素分析的可调谐红外激光直接吸收光谱 (TILDAS) 系统

• 批准号: 1933122
• 负责人: David Dettman
• 金额: $ 44.93万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-03-15 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933122&HistoricalAwards=false
• 关键词: Collaborative; Research; Improving; calibrating; Tunable

The study of “clumped-isotopes” concerns the tendency of heavy isotopes to “clump” into bonds with each other rather than with light isotopes in natural materials, a tendency that is temperature dependent. The co-occurrence of two rare and more massive isotopes of carbon and oxygen clumped in CO2 holds information on the temperature of the most recent chemical reactions involving these molecules. Clumped-isotope geochemistry has been applied to a wide range of subjects – from constraining atmospheric CO2 budgets to the temperature histories of meteorites. Measurements of clumping in CO2 have enabled new advances in reconstructing hydrothermal systems, climate history, paleoelevation, and the cooling history of the upper crust. The primary reason that this methodology is not more widely practiced is the difficulty of the measurement. This award will deliver a new laser-based instrument for measurement of clumped isotopes in carbonates that is much faster, cheaper, and requires less sample material than existing mass spectrometer systems. This new instrument will completely alter the landscape for clumped isotope research, making it a commonplace analysis. Such a system would be adopted quickly by laboratories around the world for application to geologic, oceanographic, biologic, and atmospheric samples, leading to new research possibilities in many scientific disciplines. This project also expands training and educational opportunities in this unusual sub-discipline of geochemistry. This project will support a postdoctoral researcher, strengthen international collaborations, and disseminate results through a conference session on laser methods. The project will also integrate research and education, broaden the participation of underrepresented groups, and broadly disseminate results by supporting a STEM Futures Fellowship research experience for undergraduates who identify with historically underrepresented groups in geoscience.This project builds on our previous funded work to develop a working laser-based (Tunable Infrared Laser Direct Absorption Spectroscopy - TILDAS) instrument for the rapid and precise measurement of clumped isotopologues of CO2 (e.g., 13C18O16O). The basic instrument has been constructed, but additional improvements in stability and development of practical sample processing are needed to produce an instrument that can be used widely in the scientific community. This laser-based measurement has major advantages over the currently used mass spectrometry approach in that it is much faster, taking only 20 minutes of analysis to achieve the required precision. Small sample size (comparable to the smallest mass spectrometer systems, and with the potential for further reductions) and a major increase in through-put will allow geochemists to extract previously unobtainable detailed temperature information from finely layered archives such as shell, fish otoliths, speleothems, soil carbonates, tufas and travertines. Fine sampling will also allow researchers to more effectively dissect diagenetic histories in carbonates, address questions related to solid-state reordering, study zoned fracture-filling cements precipitated in the sub-surface, and study kinetic and vital effects.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.

研究“关注重量同位素倾向于将彼此“团结”的趋势相反，相反，相反，在出生材料中的毛刺，这种趋势依赖温度。碳和氧气在二氧化碳中凝结的温度涉及分子的最大检查反应。气候历史，古甲壳的主要原因。 h的同位素研究的景观支持虫后研究人员，加强国际合作，该项目还将通过支持STEM Futures Futures奖学金研究经验，为我们先前资助的我们以前资助的构建中的不足的人提供支持的地下奖学金研究经验，从而将研究和教育融为一W ORK开发了一个基于激光的（可调红色的激光镜-Tildas）仪器，以快速而精确的二氧化碳的同源物（例如13C18O16O）的快速和精确的NT。 Protctical样本是在科学界的限制，目前可以使用质谱法。 ）整个过程的主要增加将使地球化学主义者能够从精致的档案中提取预先的温度信息。在地下ects nsf'Stututory Ofent中沉淀的填充水泥值得使用TOUNDATION EVIEW标准进行支持。