边缘效应和几何效应对SHRIMP IIe MC氧同位素分析精度影响  

Influence of Edge Effect and X-Y Effect on Measurement Precision in Sensitive High Resolution Ion Microprobe IIe MC Oxygen Isotopes Analysis

作　　者：龙涛[1,2] 石坚[1] 包泽民[1] Stephen W.J.Chement 张玉海[2] 田地[1] 刘敦一[2] 

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130026 [2]中国地质科学院地质研究所,北京100037

出　　处：《分析化学》2015年第12期1888-1894,共7页Chinese Journal of Analytical Chemistry

基　　金：国家重大科学仪器设备开发专项资助(No.2011YQ05006902)~~

摘　　要：SHRIMPⅡe MC被广泛应用于锆石、磷灰石、碳酸钙等副矿物的氧同位素分析。本工作针对其氧同位素分析过程中的边缘效应及几何效应(X-Y效应),建立二次离子提取结构的SIMION仿真模型,探讨了XY效应、边缘效应的产生原因及影响因素,为SHRIMPⅡe MC高精度氧同位素分析提供指导。通过限制氧同位素分析点位置(样品位于靶中间直径10 mm内,靶表面粗糙度<1μm),可使锆石δ^(18)O单点内部精度优于0.15‰(1σ),外部精度优于0.5‰(95%的置信区);碳酸盐矿物δ^(18)O单点内部精度优于0.20‰(1σ),外部精度优于0.6‰(95%的置信区)。Sensitive high resolution ion microprobe（SHRIMP） Ⅱe MC has been widely used in the oxygen isotopes analysis of zircon,apatite,calcium carbonate,etc..This study provides guidance for SHRIMP Ⅱe MC high precision O-isotope analysis.We have established the secondary ion extraction structure of SIMION simulation model and discussed the cause and influencing factors of edge effect and X-Y effect in oxygen isotopes analysis.Higher δ^（18） O precision can be reached by limiting O-isotope analysis position（the sample is located at the center of the mount within 10 mm diameter and the target surface roughness is less than 1 μm）.The internal precision of single spot of zircon δ^（18） O is better than 0.15‰（lσ）,with external precision better than 0.5%（95% confidence）;the internal precision of the single analysis of Carbonate δ^（18）O is better than0.20‰（1σ）,with external precision better than 0.6‰（95% confidence）.

关 键 词：高分辨率离子探针 氧同位素分析 边缘效应 几何效应 

分 类 号：O657.63[理学—分析化学]