显微激光拉曼光谱测定二氧化碳碳同位素  

Study on carbon isotope analysis in CO_2 by micro-laser raman spectroscopy

作　　者：李荣西[1] 李佳佳[1] 董会[2] 王志海[2] 刘海青[1] 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]西安地质矿产研究所,西安710061

出　　处：《分析试验室》2015年第6期645-649,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金项目(41173055)资助

摘　　要：利用自行设计的装置,在不同压力(密度)下对13CO2气体和12CO2标准气体样品进行了在线显微激光拉曼测试,获得CO2碳同位素分子的拉曼特征峰。对实验数据分析发现,13CO2和12CO2特征峰峰强、峰强比、峰面积及峰面积比值与其密度之间存在良好的线性关系,通过线性拟合,给出了拉曼参数计算经验公式,可以建立起单个流体包裹体CO2稳定同位素激光拉曼测试方法。Stable isotope of individual fluid inclusion has great significance in researching the formation of rock and mineral paleo-fluid, geology of ore deposits, oiL/gas mineral deposits and geodynamics of tectonic evolution. Micro-laser Raman analysis is a good method for stable isotopes in single fluid inclusions. This paper introduced an instrument designed for online testing13 CO2 and12 CO2 under different pressures by Micro-laser Raman spectroscopy. The spectral characteristics of CO2 carbon isotopes including peak position, peak area and half peak width were further analyzed and studied. It was found that the gas density had a good linear correlation with its Raman spectrum intensity, the ratio of intensity, peak area and the ratio of peak area. In addition, we tried to fit it with a straight line and to create a relational expression from the test data sets. Based on the study of principles and feasibility of the proposed method, it would provide a way to analyse CO2stable isotopes of single fluid inclusions.

关 键 词：显微激光拉曼光谱 CO2 碳同位素 密度 流体包裹体 

分 类 号：TH742[机械工程—光学工程]