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纳米离子探针在显著提高空间分辨能力的同时,仍然保留了较高的质量分辨、灵敏度和分析精度.它已经成为物质成分分析的重要新平台,广泛应用于空间科学、地球科学、生命科学和材料科学等领域.通过小至50 nm的Cs+离子束扫描样品表面,它可以同时获得多达7个元素或同位素的高空间分布图像.利用法拉梯杯接收信号时,C,O和S等稳定同位素的分析精度可以达到0.3‰~0.5‰(1SD).尽管这一精度与传统离子探针0.1‰的精度水平仍有差距,但是可以满足大部分的地球科学需求.中国科学院地质与地球物理研究所于2011年安装了中国第一台纳米离子探针(Cameca Nano SIMS 50L),本文在其工作原理和分析功能的基础上,介绍基于这台仪器研发的分析方法,以及它们在地球科学中的潜在应用,包括矿物环带中微量元素分布、超高空间分辨(2~5?m)的Pb-Pb和U-Pb定年、磷灰石和硅酸盐玻璃的水含量和H同位素分析、金刚石和石墨的C同位素分析、碳酸盐的O同位素分析、硫化物的S同位素分析等.此外,为了方便国内地球科学研究者使用纳米离子探针,本文还介绍了样品制备的具体要求.
Nano-ion probe, while significantly improving the ability of spatial resolution, still retains high quality resolution, sensitivity and analysis accuracy. It has become an important new platform for the analysis of matter components and is widely used in space science, earth science, life science and Material science, etc. High-spatial distribution images of up to seven elements or isotopes can be obtained simultaneously by scanning the sample surface with a Cs + ion beam as small as 50 nm. C, O and S stabilize when receiving signals using a Faraday cup The accuracy of isotope analysis can reach 0.3 ‰ ~ 0.5 ‰ (1SD). Although this accuracy is still far behind the accuracy of 0.1 ‰ of conventional ion microprobe, most of the earth science needs can be satisfied. Chinese Academy of Geology and Geophysics In 2011, China installed the first nano-ion probe (Cameca Nano SIMS 50L). Based on its working principle and analytical functions, this paper introduced the analytical methods based on the R & D of this instrument and their applications in geosciences Potential applications include trace element distribution in mineral annuli, ultrahigh spatial resolution (2 to 5 μm) Pb-Pb and U-Pb dating, apatite and silicate glass water Quantitative and H isotope analysis, C isotope analysis of diamond and graphite, O isotope analysis of carbonate, S isotope analysis of sulfide, etc. In addition, in order to facilitate the use of nano-ion probe by domestic earth science researchers, this paper also introduced the sample Preparation of the specific requirements.