【作者】 郑莹光； 董风霞； 许静； 徐玉书； 沈尔中；

【Author】 Zheng yingguang Dong Fengxia (Analysis and Measurement Center,Jilin University,Changchun,130023) Xu Jing Xu Yushu (Institute of Atom and Molecule Physics,Jilin University,Changchun,130023) Shen Erzhong (Institute of Theoretical Chemistry,Jilin University,Changchun,130023)

【机构】 吉林大学分析测试中心； 吉林大学原子与分子物理研究所； 吉林大学理论化学研究所；

【摘要】 <正>电子自旋共振成象(ESRI)是一种确定样品中顺磁中心空间分布的快速检测方法,这种方法正逐渐应用于物理,化学,生物学和植物生理学。本文以向日葵种子为例,介绍植物种子的二维 ESR 成象,向日葵种子本身含有天然稳定的自由基,在 BRUKER ER 200D ESR 谱仪上进行检测,X-波更多还原

【Abstract】 Electron spin resonance imaging （ESRI） is a rapidly developing method for establishing spatial distribution of paramagnetic centers in a sample.This method has a wide field of potential applications,including physics,chemistry,biology and plant physiology. In the present paper we will describe the two-dimensional ESRI of the sunflower grain with natural stable free radicals.The concentration of natural stable free radicals in a sunflower grain is about 10¹⁴spins,exhibiting at X-band a single ESR signal with a line width about 1.13 mT.One dimensional-mode projection were obtained in 0-180°at with a BRUKER ER 200D-SRC ESR spectrometer.The value of magnetic field gradient was 2.5 mT/cm. A efficient algorithm has been designed for reconstructing ESRI,on the basis of projection profile principle,which can be used to plot contour distribution graph of the sample spin density distribution on a cross-section.更多还原