作　　者： ; ; ;

机构地区： 中山大学物理科学与工程技术学院

出　　处： 《中山大学学报（自然科学版）》 2009年第6期38-41,共4页

摘　　要： 研究二元体系光抽运响应规律有助于了解体系之间原子相互作用和提供光抽运响应时间控制的可能性。利用Rb同位素85Rb和87Rb组成自然二元体系,通过双通道加法器选择控制2路射频信号并采用10 Hz方波调制场,实现单一体系或混合体系的光抽运响应观测。基于简化三能级模型,采用单一指数函数准确地描述87Rb和85Rb二元混合体系和独立一元体系的响应弛豫。由混合体系与独立单元之间弛豫时间关系,也可获得混合体系中独立单元浓度及对系统弛豫时间的贡献。 Investigation of optical pumping for binary mixtures may provide information on the interaction between atomic systems and open up possibility to control response time. Considered Rb isotope 85 Rb and 87Rb as binary mixtures, optical pumping response can be observed with using square modulated field at lOHz and two channels of RF sources for NMR of 85Rb and STRb respectively. Based on proposed model of three energy levels, unitary system or binary mixtures of 85 Rb and 87 Rb can be accurately described with an exponential function. According to the relation of response time between binary and unitary, the response time for mixtures is contributed from unitary ones and their concentrations.

关 键 词： 光抽运 核磁共振 二元体系 响应

领　　域： [理学] [理学]