Deeksha Khandelwal, Pankaj Kumar, P. V. Kumar, Atul K. Singh, Mahadev Rawat, Anit Dawar, R. Sharma, S. Ojha, S. Gargari, P. K. Mukherjee, S. Chopra, A. C. Pandey
{"title":"大型几何高分辨率二次离子质谱仪（HR-SIMS）高精度测量锆石氧同位素组成（δ18O）和U-Pb年代学的性能优化","authors":"Deeksha Khandelwal, Pankaj Kumar, P. V. Kumar, Atul K. Singh, Mahadev Rawat, Anit Dawar, R. Sharma, S. Ojha, S. Gargari, P. K. Mukherjee, S. Chopra, A. C. Pandey","doi":"10.1002/jms.5103","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>A large geometry high resolution secondary ion mass spectrometer (HR-SIMS) has been established as a part of the National Geochronology Facility (NGF) at Inter-University Accelerator Centre (IUAC), New Delhi. The performance of the instrument related to high spatial resolution, high mass resolving power (MRP), sensitivity of the instrument to measure low abundant isotopes, and sensitivity of the instrument for <sup>206</sup>Pb signal under different conditions are optimized and presented in this paper. We report the precision of the order of ~ 0.2‰ for oxygen isotopes measurement in 91500 reference material zircon and measured δ<sup>18</sup>O value of 10.08‰ ± 0.18‰ (2SD), which is in agreement with the recommended values. For U–Pb age measurement in zircon, Plešovice and FCT reference materials are measured as unknown and their <sup>206</sup>Pb/<sup>238</sup>U ages agree with the reported values within the uncertainties. A long-term evaluation of <sup>206</sup>Pb/<sup>238</sup>UO and <sup>206</sup>Pb/<sup>238</sup>U isotopic measurement ratio is also presented.</p>\n </div>","PeriodicalId":16178,"journal":{"name":"Journal of Mass Spectrometry","volume":"60 1","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Performance Optimization of a Large Geometry High Resolution-Secondary Ion Mass Spectrometer (HR-SIMS) for High Precision Measurements of Oxygen Isotopic Composition (δ18O) and U–Pb Geochronology in Zircon\",\"authors\":\"Deeksha Khandelwal, Pankaj Kumar, P. V. Kumar, Atul K. Singh, Mahadev Rawat, Anit Dawar, R. Sharma, S. Ojha, S. Gargari, P. K. Mukherjee, S. Chopra, A. C. Pandey\",\"doi\":\"10.1002/jms.5103\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n <p>A large geometry high resolution secondary ion mass spectrometer (HR-SIMS) has been established as a part of the National Geochronology Facility (NGF) at Inter-University Accelerator Centre (IUAC), New Delhi. The performance of the instrument related to high spatial resolution, high mass resolving power (MRP), sensitivity of the instrument to measure low abundant isotopes, and sensitivity of the instrument for <sup>206</sup>Pb signal under different conditions are optimized and presented in this paper. We report the precision of the order of ~ 0.2‰ for oxygen isotopes measurement in 91500 reference material zircon and measured δ<sup>18</sup>O value of 10.08‰ ± 0.18‰ (2SD), which is in agreement with the recommended values. For U–Pb age measurement in zircon, Plešovice and FCT reference materials are measured as unknown and their <sup>206</sup>Pb/<sup>238</sup>U ages agree with the reported values within the uncertainties. A long-term evaluation of <sup>206</sup>Pb/<sup>238</sup>UO and <sup>206</sup>Pb/<sup>238</sup>U isotopic measurement ratio is also presented.</p>\\n </div>\",\"PeriodicalId\":16178,\"journal\":{\"name\":\"Journal of Mass Spectrometry\",\"volume\":\"60 1\",\"pages\":\"\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-12-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Mass Spectrometry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/jms.5103\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"BIOCHEMICAL RESEARCH METHODS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Mass Spectrometry","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jms.5103","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
Performance Optimization of a Large Geometry High Resolution-Secondary Ion Mass Spectrometer (HR-SIMS) for High Precision Measurements of Oxygen Isotopic Composition (δ18O) and U–Pb Geochronology in Zircon
A large geometry high resolution secondary ion mass spectrometer (HR-SIMS) has been established as a part of the National Geochronology Facility (NGF) at Inter-University Accelerator Centre (IUAC), New Delhi. The performance of the instrument related to high spatial resolution, high mass resolving power (MRP), sensitivity of the instrument to measure low abundant isotopes, and sensitivity of the instrument for 206Pb signal under different conditions are optimized and presented in this paper. We report the precision of the order of ~ 0.2‰ for oxygen isotopes measurement in 91500 reference material zircon and measured δ18O value of 10.08‰ ± 0.18‰ (2SD), which is in agreement with the recommended values. For U–Pb age measurement in zircon, Plešovice and FCT reference materials are measured as unknown and their 206Pb/238U ages agree with the reported values within the uncertainties. A long-term evaluation of 206Pb/238UO and 206Pb/238U isotopic measurement ratio is also presented.
期刊介绍：
The Journal of Mass Spectrometry publishes papers on a broad range of topics of interest to scientists working in both fundamental and applied areas involving the study of gaseous ions.
The aim of JMS is to serve the scientific community with information provided and arranged to help senior investigators to better stay abreast of new discoveries and studies in their own field, to make them aware of events and developments in associated fields, and to provide students and newcomers the basic tools with which to learn fundamental and applied aspects of mass spectrometry.
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