作　　者： ; ; ; ; ;

机构地区： 中山大学物理科学与工程技术学院光电材料与技术国家重点实验室

出　　处： 《Chinese Journal of Chemical Physics》 2005年第3期303-307,共5页

摘　　要： 用Brown振子模型研究YAG基质材料中Nd3+4f电子跃迁的电子声子相互作用过程,详尽推导电子声子耦合的表达式,计算了电声耦合常数不同时的激发光谱,结果表明,电声耦合作用使电子跃迁的吸收峰两边产生声子吸收峰,电声耦合作用较强时,可以产生多级声子吸收峰.通过模拟实验激发光谱,得到样品的电声耦合常数和声子频率等参数,和半导体比较,样品的电声耦合常数较小,说明4f电子声子的耦合属弱相互作用.用这些参数计算时间分辨的荧光相干光谱,其结果与实验结果一致. The 4f electronic transition accompanied by electron-phonon interaction was studied through the Brownian oscillator model in Nd: YAG. The expression of electron-phonon coupling was derived, the excitation spectroscopies of different electron-phonon coupling constants were calculated and the results indicated the absorption peak of phonon in two sides of electronic peak is produced by electron-phonon coupling. The stronger electron-phonon coupling, the more phonon peaks. Through excitation spectroscopy simulation, the electron-phonon coupling constant and phonon frequency were obtained. From these data, the theoretical time resolved coherent spectroscopy was calculated and is good agreement with experiment result. It also indicated that the electron-phonon coupling in rare earth ion's 4f electronic transition is weak because of the smaller constant of electron-phonon coupling compared with that of semiconductor.

关 键 词： 相干光谱 激发光谱 布朗振子

领　　域： [电子电信]