石英E′_1心ESR信号强度的影响因子分析  

Factors influencing the ESR signal intensity of E′_1 center of quartz

作　　者：陈洪云[1,2] 林敏[3] 孙有斌[1] 赵剑波[1,2] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [2]中国科学院研究生院,北京100049 [3]中国原子能科学研究院,北京102413

出　　处：《地球环境学报》2011年第4期497-502,共6页Journal of Earth Environment

基　　金：国家自然科学基金项目(40772117;41072272);百人计划项目

摘　　要：本文讨论了影响沙漠表土样品风成石英E′_1心ESR(电子自旋共振)信号强度的诸因子,包括人工辐照、热退火、ESR测量位置旋转及人工研磨等,以探讨不同粒级石英颗粒中的E′_1心ESR信号强度差异的原因。结果表明:(1)人工辐照和热退火对石英E′_1心ESR信号强度的影响明显,使得ESR信号强度明显提高,且各粒径的ESR信号强度增幅一致;(2)ESR测量位置旋转可影响>63μm粒级组分的测定结果,表明粗颗粒样品的混合度较差,建议测量前对样品进行适当的研磨;(3)人工研磨对于<63μm粒级组分的石英ESR信号强度影响不明显,但可以有效增强>63μm粒级组分的信号强度。Influences of different factors such as irradiation, annealing, grinding, and position shift on the Electron Spin Resonance （ESR） signal intensity of the E1′ center of eolian quartz from Asian deserts were investigated to address the origin of different ESR signal intensity of quartz with various grain size classes. The results indicate that： （1） irradiation and annealing have clear impacts on the increase of the ESR signal intensity and their influences are similar among different grain size classes; （2） position shift during the ESR measurements might only influence the ESR signal intensity of the sandy-sized quartz （〉63 μm） because of the weak mixing of coarse grained particles, suggesting that a moderate grinding is necessary before the ESR analysis; （3） grinding has little effects on the ESR signal intensity of clay to silt fractions but can lead to increase of the ESR signal intensity of sandy grained quartz.

关 键 词：石英 E1'心 ESR信号强度 

分 类 号：P578.494[天文地球—矿物学]