二元混合体系的光抽运响应分析

 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。

Responsibility to Optical Pumping for Binary Mixtures of Rb Isotope

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 ~(87)Rb as binary mixtures, optical pumping response can be observed with using square modulated field at 10Hz and two channels of RF sources for NMR of ~(85)Rb and ~(87)Rb 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.