Analysis of the Zeeman effect on Dαspectra on the EAST tokamak

Based on the passive spectroscopy,the D_α atomic emission spectra in the boundary region of the plasma have been measured by a high resolution optical spectroscopic multichannel analysis（OSMA） system in EAST tokamak.The Zeeman splitting of the D_α spectral lines has been observed.A fitting procedure by using a nonlinear least squares method was applied to fit and analyze all polarization π and ±σ components of the D_α atomic spectra to acquire the information of the local plasma.The spectral line shape was investigated according to emission spectra from different regions（e.g.,low-field side and high-field side） along the viewing chords.Each polarization component was fitted and classified into three energy categories（the cold,warm,and hot components） based on different atomic production processes,in consistent with the transition energy distribution by calculating the gradient of the D_α spectral profile.The emission position,magnetic field intensity,and flow velocity of a deuterium atom were also discussed in the context.

Zeeman effects on Josephson current in d-wave superconductor/d-wave superconductor junctions

This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and thermodynamic potential. The Josephson currents in the d-wave superconductor（S）/insulating layer（I）/d-wave S junctions are calculated as a function of the temperature, exchange field, and insulating barrier strength under a Zeeman magnetic field on the two d-wave Ss. It is found that the Josephson critical currents in d-wave S/d-wave S junction to a great extent depend on the relative orientation of the effective exchange field of the two S electrodes, and the crystal orientation of the d-wave S. The exchange field under certain conditions can enhance the Josephson critical current in a d-wave S/I/d-wave S junction.

Analysis of asymmetry of the D_(α)emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak

In 2015 campaign,deuterium atomic emission spectra(D_(α))under the Zeeman effect in boundary region had been measured by a high resolution optical spectroscopic multichannel analysis(OSMA)system based on passive spectroscopy during the deuterium plasma discharge on EAST tokamak,and part of the works about the Zeeman effect on D_(α)spectra had already been done.However,the asymmetric phenomena of D_(α)emission spectra under the Zeeman effect were observed in process of analyzing the spectral data.To understand the asymmetric phenomena and acquire the useful local plasma information,an algorithm was proposed and used to analyze the asymmetry of the emission spectra under the Zeeman effect with all polarization components(πand±σ).In the algorithm,the neutral atoms were considered to follow the Maxwell distribution on EAST,and I+σ=I-σwas considered and set.Because of the line-averaged spectra along the viewing chord,the emission spectra were considered from two different regions:low-field side(LFS)and high-field side(HFS).Each spectral line was classified into three energy categories(the cold,warm,and hot)based on different atomic production processes in boundary recycling.The viewing angleθ(between the magnetic field B and the viewing chord),magnetic field B at two spectral emission positions(HFS and LFS)and the Doppler shift of all three energy categories of each spectral line were all considered in the algorithm.The effect of instrument function was also included here.The information of the boundary plasma were acquired,the reason for the asymmetric phenomena was discussed,and the boundary recycling during the discharge were studied in the paper.Based on fitting a statistical data of acquired fitting results,an important conclusion was acquired that the ratio of the spectral line intensity in HFS and LFS was proportional to the square of that of the corresponding magnetic field.

Zeeman Effect of the Rovibronic Ground State of I35Cl at Hyperfine Level

Zeeman effect at the hyperfine level of the rovibronic ground state of I35Cl are determined on the basis of ｜I1JF1I2FMF｜ via an effective Hamiltonian matrix diagonalization method. Perturbations of the Zeeman sub- levels are observed and the perturbation selection rules are summarized as well. Several potential applications of such Zeeman effect are suggested.

Mixed-field effect at the hyperfine level of^(127)I^(79)Br in its rovibronic ground state:Toward field manipulation of cold molecules

The mixed-field effect at the hyperfine level of the rovibronic ground state of the^(127)I^(79)Br(X^(1)Σ,v=0,J=0)molecule is computed on the J-I uncoupled basis of|JM_(J)I_(1)M_(1)I_(2)M_(2)>,where J is the molecular total angular momentum excluding nuclear spin,M_J is the projection number of J,I_(1) and I_(2) are the nuclear spins of the iodine and bromine atoms,and M_(1) and M_(2) are the projection numbers of I_(1) and I_(2),respectively.When the two applied electric and magnetic fields are parallel,the perturbations are rare and only one perturbation is observed in a relatively large field regime in our computation range.However,when the two fields are off-parallel,the perturbations increase significantly and some sublevels show the Feshbach-like resonance phenomenon.Therefore,such sublevels transit between weak-field seeking and strong-field seeking repeatedly,which can be utilized to enhance or suppress cold molecular collision and chemical reaction rates.Such behavior of the molecular hyperfine structure in the mixed off-parallel fields may also be utilized to construct an electric-field-assisted anti-Helmholtz magnetic trap for cold molecules and to realize evaporative cooling of cold molecules(sub-mK)into the ultracold regime(μK).

Thermospin effects in parallel coupled double quantum dots in the presence of the Rashba spin-orbit interaction and Zeeman splitting

The thermoelectric and the thermospin transport properties, including electrical conductivity, Seebeck coefficient, thermal conductivity, and thermoelectric figure of merit, of a parallel coupled double-quantum-dot Aharonov-Bohm interferometer are investigated by means of the Green function technique. The periodic Anderson model is used to describe the quantum dot system, the Rashba spin-orbit interaction and the Zeeman splitting under a magnetic field are considered. The theoretical results show the constructive contribution of the Rashba effect and the influence of the magnetic field on the thermospin effects. We also show theoretically that material with a high figure of merit can be obtained by tuning the Zeeman splitting energy only.

塞曼效应实验中固体F-P标准具的应用与教学

塞曼效应实验是高校近代物理实验课程中的重要内容,学校大多采用空气隙法布里-珀罗(F-P)标准具作为分光元件,本文介绍了固体F-P标准具在塞曼效应实验中的教学与应用、干涉分光的基本原理与特征以及干涉图样的分布规律.结合相关现象与分析,给出了塞曼效应实验的光路调节、谱线观测等过程.该实验教学过程可以加深学生对F-P标准具原理的理解.

塞曼效应实验之虚拟仿真与电脑辅助对比分析

塞曼效应实验通过测量汞绿光在磁场中分裂谱线的波长差计算电子的荷质比。电脑辅助版塞曼效应实验利用CCD图像采集卡将法布里-珀罗标准具等倾干涉图像采集到电脑,再利用塞曼效应实验分析软件对图像进行处理,测出光分裂的谱线波长差,计算出电子荷质比。虚拟仿真型塞曼效应实验则是利用科大奥锐提供的虚拟仿真实验系统,从实验仪器的摆放、调试到测量及数据处理,实现对塞曼效应实验的全程模拟仿真。电脑辅助版塞曼效应实验克服了过去手工测量的诸多缺陷,但并没有解决所有不足,还带来一些新问题。塞曼效应虚拟仿真实验几乎解决了传统塞曼效应实验所遇到的所有问题,只要必要的步骤操作到位,就可以得到理想的实验结果。通过研究分析,深刻认识到两种实验方式相互不能完全替代,但可以作为有益补充。

采用Zeeman效应与饱和吸收法的激光器稳频

由于塞曼效应中性原子的超精细能级在磁场中会产生塞曼分裂,且对于左旋和右旋圆偏振光原子能级的偏移不同,因此利用Zeeman效应的这种特性与饱和吸收相结合的方法对光栅外腔反馈的半导体激光器系统进行稳频。这种方法能够将激光频率稳定地锁在原子吸收谱线的峰值处,锁频后激光器不易失锁,用于激光冷却铷原子实验。

Hg同位素对Hg的Zeeman效应相对强度的影响

比较了Hg的546.1 nm绿谱线Zeeman效应相对强度的理论计算和实验值,分析了Hg同位素位移及超精细结构对Hg的 Zeeman效应相对强度的影响.

Rashba效应和Zeeman效应对各向异性量子点中束缚磁极化子性质的影响

采用Pekar变分法和幺正变换相结合的方法研究了各向异性量子点中束缚磁极化子的Rashba效应和Zeeman效应.通过理论推导,得到束缚磁极化子基态能量的表达式.讨论了极化子基态能量与横向有效受限长度、纵向有效受限长度、磁场回旋共振频率、库仑束缚势的关系.由于晶体结构反演非对称性和时间反演非对称性,极化子能量发生Rashba自旋轨道分裂和Zeeman分裂.在强、弱磁场下,分别讨论了Zeeman效应和Rashba效应在能量分裂中所占的主导地位.由于声子和杂质的存在,极化子比裸电子态更稳定.

精密激光小角度测量装置设计

本文激光小角度测量装置采用正弦原理和激光干涉技术,实现对小角度量高准确度测量。该装置具有独立的回转轴系,可确保稳定性;采用400mm大臂长结构设计,可提高灵敏度;空心式角隅棱镜等光学器件设计和光源的选择,可避免多种误差源的干扰。同时,在高准确度的小角度计量方面,提出了多种新的设计和改进,实现了小角度测量误差优于0.05″,并通过同等级仪器间的测量比对,验证整套装置良好的测量效果。

Zeeman效应中光偏振的实验研究

介绍一种永磁式塞曼效应实验仪，用其研究了任意方向上塞曼效应的光偏振态和光强问题，并测定了电子的ｅ／ｍ，给出了测量方法和结果．

对Zeeman效应中π偏振横效应的证明

把Zeeman效应中的辐射场矢量进行量子化,建立了光矢量E与电偶极跃迁矩阵元及选择定则的联系,从而定量地证明了该效应中π偏振的横效应只能是线偏振。

铷原子基态子能级的AC Zeeman移动

文中测量了微波场通过 AC Zeeman效应引起铷原子基态超精细子能级移动值 ,系统研究了能级移动随微波场的频率和功率变化所表现出来的规律。

塞曼效应电热原子吸收光谱法测定化妆品中总汞含量

建立塞曼效应电热原子吸收光谱法检测化妆品中总汞含量的方法。结果显示,在膏霜类、乳液类、粉类、蜡基类化妆品方法的检出限(LOD)为0.4 ng/g,定量限(LOQ)为1.2 ng/g,液态类化妆品方法的LOD为0.1 ng/mL,LOQ为0.3 ng/mL。在低、中、高不同加标水平时,相关系数均大于0.999,线性关系良好,加标回收率为91.7%~109.7%,相对标准偏差为0.7%~4.4%(n=6),质控样测定结果均在标准值范围之内。利用该方法对15批次不同基质化妆品中汞含量进行测定,并与原子荧光光度法、汞分析仪法测定结果进行比较,结果基本一致,且灵敏度更高。因此,该方法简便、快速,测定结果准确度可靠,灵敏度高且重现性好,适用于不同基质化妆品中总汞含量的测定。

三角量子阱中磁极化子的Zeeman效应和Rashba效应

采用Pekar变分法研究了三角量子阱中磁极化子的Zeeman效应和Rashba效应,理论推导得到磁极化子基态能量的表达式。结果表明,磁极化子的基态能量不仅是波矢和磁场回旋共振频率的函数,而且还是电子面密度和电子-声子耦合强度的函数;由于晶体结构反演非对称性及磁场的影响,磁极化子能量发生Rashba自旋轨道分裂和Zeeman分裂;在强、弱磁场下,分别讨论了Rashba效应和Zeeman效应在能量分裂中所占的主导地位;由于声子的存在降低了极化子的总能量,使得极化子态比裸电子态更稳定。

基于OpenCV提升电子荷质比的测量精度

利用计算机视觉库OpenCV提供的Hough圆检测方法对塞曼效应实验中光的干涉圆环进行拟合,采用拟合的直径数据计算电子荷质比,并与CCD自带的三点画圆测量干涉圆环直径的方法进行对比.实验结果表明:利用三点画圆方法得到的数据计算电子荷质比的相对偏差为9.09%,利用Hough圆检测方法得到的数据计算电子荷质比的相对偏差为1.13%,有效提升了测量精度.为了提升测量的便捷性,基于Vue数据双向绑定技术,实现了基于HTML5的跨平台交互应用界面,打破了编程语言需要特定运行环境的限制,在该界面中,通过对拟合参量的调节,实现干涉圆环和圆心的同步拟合显示,并将拟合得到的圆心坐标和直径大小直观显示在界面中,方便电子荷质比的计算.

Zeeman效应实验一定能推断出原子的g_J值吗?

本文以实例对Zeeman效应一定能推断原子的gJ值问题做了否定的回答。

自旋轨道耦合作用的等效磁场

自旋与电荷一样,是电子的固有属性,电子的周期性轨道运动产生的磁场与电子的自旋磁矩相互作用,这种磁相互作用就是自旋轨道相互作用。在原子物理学中,这种自旋轨道作用会影响原子光谱的精细结构,然而教材中缺少自旋轨道耦合作用在二维半导体材料中的微观描述。本文将引入Rashba和Dresselhaus自旋轨道耦合作用的哈密顿量,研究单电子在无外场下二维平面内运动,讨论一种或者两种自旋轨道耦合的哈密顿量表示。通过自旋与等效磁场耦合的塞曼能量表示,本文计算了本征态下不同自旋轨道耦合作用下的等效磁场,从而有助于探索二维半导体材料中不同自旋轨道耦合作用下的物理特性。