Sm原子偶宇称高激发态偏振光谱  

Polarization Spectra of Even-Parity Highly Excited States of Samarium Atom

作　　者：陈枫 张雪倩 张小虎 张文纳 黄庆 沈礼[1] Chen Feng;Zhang Xueqian;Zhang Xiaohu;Zhang Wenna;Huang Qing;Shen Li(School of Science,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学理学院,天津300384

出　　处：《激光与光电子学进展》2021年第11期362-367,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11004151);国家级大学生创新创业训练计划(201810060026);天津市高等学校创新团队培养计划(TD3-5029)。

摘　　要：为了确认偏振光谱技术对复杂Sm原子的适用性,本文采用双色两步共振激发技术和光电离探测技术对Sm原子偶宇称高激发态的光谱进行了研究。首先,通过两步激发将处于基态4f^(6)6s^(27)F_(0)的Sm原子激发到偶宇称激发态(总角动量量子数J=0~2),并采用光电离技术对其进行探测;然后,通过对ππ、πσ、σ^(+)σ^(+)和σ^(+)σ^(-)不同偏振组合下的光谱进行对比分析,利用偏振选择定则确定了三个偶宇称高激发态的总角动量量子数J;最后,通过改变两步线偏振激发光光振动方向的夹角,得到了光电离信号与该角度的关系,从而验证了偏振光谱技术对Sm原子的适用性。To confirm the applicability of polarization spectroscopy to complex Sm atoms, we employed two-color two-step resonance excitation and photoionization detection techniques to study the spectra of even-parity highly excited states of an Sm atom. First, through two-step excitation, an Sm atom in the ground state 4f^(6)6s^(27)F_(0) was excited to the even-parity excited states(angular momentum quantum numbers, J=0-2), and photoionization was used for detection. The spectra were compared and analyzed under different polarization combinations, and the total angular momentum quantum numbers J of the three even-parity highly excited states were determined using the polarization selection rule. Finally, by changing the angle of the vibration directions of the two linear polarized lights, we established the relationship between the photoionization signal and the angle, which verifies the applicability of polarization spectroscopy to Sm atoms.

关 键 词：光谱学 原子光谱 偏振激发 Sm原子 偶宇称 光电离 高激发态 

分 类 号：O433.1[机械工程—光学工程] O433.2[理学—光学]