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超精细结构

超精细结构的相关文献在1981年到2021年内共计100篇,主要集中在物理学、化学、无线电电子学、电信技术 等领域,其中期刊论文82篇、会议论文6篇、专利文献1767171篇;相关期刊47种,包括大学物理、光谱学与光谱分析、化学物理学报等; 相关会议6种,包括2009年全国高等学校物理基础课程教育学术研讨会、第九次全国热处理大会、第十二届全国原子与分子物理学术会议等;超精细结构的相关文献由216位作者贡献,包括马洪良、陆福全、王菲等。

超精细结构—发文量

期刊论文>

论文:82 占比:0.00%

会议论文>

论文:6 占比:0.00%

专利文献>

论文:1767171 占比:100.00%

总计:1767259篇

超精细结构—发文趋势图

超精细结构

-研究学者

  • 马洪良
  • 陆福全
  • 王菲
  • 黄明宝
  • 刘亚军
  • 张孟
  • E·莫
  • Y·欧菲儿
  • Y·艾米泰
  • 李丽
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 刘亚君; 程新路
    • 摘要: 采用矩阵对角化方法计算了40Ca35Cl分子的超精细结构能级,借助有效哈密顿算符获得了40Ca35Cl分子基态超精细能级的本征值.计算结果表明,得到的跃迁光谱数据与实验值符合的很好,误差仅在0 kHz?90 kHz,并好于之前的理论计算值.希望这些数据能为以后激光冷却40Ca35Cl分子提供有力的理论依据.
    • 唐家栋; 刘乾昊; 程存峰; 胡水明
    • 摘要: HD分子红外跃迁的精密测量被用以检验量子电动力学、确定质子-电子质量比等.但HD分子的超精细结构分裂对于测量精度是一个很重要的限制因素,并可能是实验中测得υ=2—0谱带跃迁呈特殊线型的原因之一.本文分别在耦合表象和非耦合表象下计算了HD分子振转跃迁的超精细结构,并计算了不同外加磁场下HD分子(2-0)带中R(0),P(1),R(1)线的超精细结构,模拟了10 K低温下对应的光谱结构.结果表明,HD分子跃迁结构可随磁场发生明显变化.这可能有助于分析HD分子跃迁特异线型产生的机制,进一步获得其准确的跃迁中心频率,用于基础物理学检验.
    • 孙文博; 张慧云; 郑盟锟; 王合英; 陈宜保
    • 摘要: 饱和吸收光谱(saturated absorption spectroscopy,简称SAS)是一种常用的精密激光光谱技术,可用于消除光谱中的多普勒展宽.该技术是磁光阱实验体系的重要组成部分,是冷原子研究领域实验开展的基础.清华大学近代物理实验室自主设计和建设了饱和吸收光谱教学实验装置,并用于教学实践.使学生通过该实验学习理解原子能级、光谱展宽机制、吸收谱原理、微分谱应用方法等,并通过数据分析计算Rb原子气体温度、激发态寿命等,拓展眼界,启发兴趣,让学生对冷原子物理研究领域有更深入的理解.
    • 张祥; 卢本全; 李冀光; 邹宏新
    • 摘要: 本文首先在Dirac-Hartree-Fock近似下理论评估了Hg+离子5d106s 2S1/2→5d96s2 2D5/2钟跃迁的质量位移(mass shift,MS)和场位移(field shift,FS)在其同位素位移(isotope shift,IS)中的相对贡献,发现MS远小于FS而可以被忽略.在此基础上,通过系统地考虑该原子体系中主要的电子关联效应,计算了这条钟跃迁FS的精确值以及涉及到的上下两个能级的超精细结构常数,并得到了几种稳定汞同位素离子该跃迁的IS和超精细结构分裂.其中,计算的199Hg+和198Hg+离子之间的钟跃迁频率偏移与已有实验测量值相比误差为2%左右.最终,本文给出了汞离子7种常见同位素该谱线的绝对频率值,为实验上的谱线测量提供了有效的理论依据.%The Dirac-Hartree-Fock approximation is adopted to calculate the mass shift and the field shift for the 5d106s 2S1/2→5d96s2 2D5/2 clock transition in Hg+. It is found that the field shift is much larger than the mass shift so that the latter can be neglected in the isotope shift. In addition, we estimate that the isotope shifts of the levels related to the 5d106s 2S1/2→5d96s2 2D5/2 clock transition of Hg+ is on the order of about 104 GHz, while the hyperfine structure splitting is in a range of 1?10 GHz. However, the isotope shift of the 5d106s 2S1/2→5d96s2 2D5/2 clock transition is on the same order of magnitude as the hyperfine structure splitting. Therefore, the hyperfine structure splitting must be taken into account for predicting the frequency shifts of the clock transition between different isotopes. On the basis of these results, we perform a multi-configuration Dirac-Hartree-Fock calculation on the field shift of the 5d106s 2S1/2→5d96s2 2D5/2 clock transition in Hg+ and the hyperfine interaction constants of the upper and the lower levels involved. In order to give accurate theoretical results of these physical quantities, we systematically consider the main electron correlations in the atomic system by using the active space method. The restricted single and double (SrD) excitation method is used to capture the correlation between the 5d and the 6s valence electrons, and the correlation between the 3s, 3p, 3d, 4s, 4p, 4d, 5s, 5p, and 5d core and the valence electrons. The isotope shifts and hyperfine structure splitting for this transition of several stable mercury isotopes are given. In particular, the uncertainty of the calculated isotope shift between 199Hg+ and 198Hg+ is about 2%, compared with the experimental measurement available. Using these results, we predict the absolute frequency values of this transition for seven mercury isotopes, which provides theoretical reference data for experiments. Moreover, the calculated isotope shifts and hyperfine structures are also useful for studying the structure, property and nucleon interaction of mercury nucleus.
    • 张祥; 卢本全; 李冀光; 邹宏新
    • 摘要: 本文首先在Dirac-Hartree-Fock近似下理论评估了Hg^+离子5d^(10)6s ~2S_(1/2)→5d^96s^2 ~2D_(5/2)钟跃迁的质量位移(mass shift, MS)和场位移(field shift, FS)在其同位素位移(isotope shift, IS)中的相对贡献,发现MS远小于FS而可以被忽略.在此基础上,通过系统地考虑该原子体系中主要的电子关联效应,计算了这条钟跃迁FS的精确值以及涉及到的上下两个能级的超精细结构常数,并得到了几种稳定汞同位素离子该跃迁的IS和超精细结构分裂.其中,计算的^(199)Hg^+和^(198)Hg^+离子之间的钟跃迁频率偏移与已有实验测量值相比误差为2%左右.最终,本文给出了汞离子7种常见同位素该谱线的绝对频率值,为实验上的谱线测量提供了有效的理论依据.
    • 裴栋梁; 何军; 王杰英; 王家超; 王军民
    • 摘要: The spectra of Rydberg atoms are of great significance for studying the energy levels of Rydberg atoms and the interaction between neutral atoms, especially, the high-precision spectra of Rydberg atoms can be used to measure the energy level shifts of Rydberg atoms resulting from the dipole-dipole interactions in room-temperature vapor cells. In this paper we report the preparation of cesium Rydberg states based on the cascaded two-photon excitation of 509 nm laser and 852 nm laser in opposite, and the measurements of the fine structure of cesium Rydberg states. In this experiment, the 509 nm laser is generated by the cavity-enhanced second-harmonic generation from 1018 nm laser with a periodically-poled KTP crystal and has a maximum power of about 1 W, and the 852 nm probe laser is provided by an external-cavity diode laser with a maximum output power of 5 mW and a typical linewidth of 1 MHz. By scanning the frequency of 509 nm coupling laser, it is presented that the Doppler-free spectra based on electromagnetically-induced transparency (EIT) of 509 nm coupling laser and 852 nm probe laser. The velocity-selective EIT spectra are used to study the spectral splitting of 6S1/2—6P3/2—57S(D) ladder-type system of cesium Rydberg atoms in a room-temperature vapor cell. The powers of 852 nm probe laser and 509 nm coupling laser are 0.3 μW and 200 mW, respectively. Their waist radii are both approximately 50 μm. The intervals of hyperfine splitting of the intermediate state 6P3/2(F′ = 3, 4, 5) and fine splitting of 57D3/2 and 57D5/2 Rydberg states are measured by a frequency calibrating. Concretely, the velocity-selective spectrum with a radio frequency (RF) modulation of 30 MHz is used as a reference to calibrate the Rydberg fine-structure states in the hot vapor cell, where the RF frequency precision is smaller than a hertz on long time scales and the EIT linewidth is smaller than 13 MHz. The experimental value of the fine structure splitting of 57D3/2 and 57D5/2 Rydberg states is (354.7 ± 2.5) MHz, that is in consistence with the value of 346.8 MHz calculated by Rydberg-Ritz equation and quantum defects of 57D3/2 and 57D5/2 Rydberg states. The experimental values of hyperfine splitting of intermediate state 6P3/2(F′ = 3, 4, 5) are also coincident with the theoretical calculated values. The dominant discrepancy existing between the experimental and calculated results may arise from the nonlinear correspondence of the PZT while the 509 nm wavelength cavity is scanned, and the measurement accuracy influenced by the spectral linewidth. The velocity-selective spectroscopy technique can also be used to measure the energy level shifts caused by the interactions of Rydberg atoms.%里德伯态光谱是测量里德伯态能级结构和中性原子间相互作用的常用技术手段,特别是高精度的里德伯光谱,可以测量室温原子气室中由偶极相互作用等导致的原子能级频移.在实验中利用反向的852 nm激光和509 nm激光实现了室温原子气室中铯原子6S1/2—6P3/2—57S(D)跃迁的级联双光子激发,实现了里德伯态原子的制备.基于阶梯型电磁诱导透明获得了铯原子里德伯态的高分辨光谱.实验中,基于速度选择的射频边带调制技术,对光谱信号进行了频率标定,测量了铯原子里德伯态57D3/2和57D5/2的精细分裂,分裂间隔为(354.7±2.5)MHz,与理论计算结果基本一致.速度选择的射频调制光谱可以实现里德伯态原子的能级分裂测量,其测量精度对于单光子跃迁的绝对激光频率不敏感;实验中影响57D3/2和57D5/2精细分裂间隔测量精度的主要因素是功率加宽导致的电磁感应透明信号的展宽和509 nm激光频率扫描的非线性.
    • 杨楠; 汤勉刚
    • 摘要: 应用了电子自旋共振技术来研究有机半导体1,1-二苯基-2-三硝基苯肼(DPPH)中自由基未成对电子的超精细结构和塞曼劈裂.通过测量共振磁场大小和微波频率,我们得到了自由基未成对电子的朗德g因子.在实验中,一种混合接头(magic-T)波导管被用来提高信噪比.朗德g因子的测量结果为2.033±0.0003,与其他实验中测得的期望值2.0036相吻合.这个方法可以用以研究各种材料、生物系统中自由基未成对电子,并可进一步应用于研究电子芯片微电感上的自由基.
    • 王宁; 谢林华
    • 摘要: 在晶体场理论(CF机制)和电荷转移机制(CT机制)的基础上,结合双自旋-轨道耦合参量模型、自旋哈密顿量的高阶微扰公式及晶场能量公式计算得到C_3H_7NO_2:VO^(2+)晶体的自旋哈密顿量(EPR参量)和吸收光谱,及电荷转移跃迁能级.对比只采用CF机制和采用双重机制下的计算结果,发现高价钒离子(V^(4+))掺杂在C_3H_7NO_2晶体中的CT机制对于其EPR参量的影响不能忽略.
    • 任雅娜; 杨保东; 王杰; 杨光; 王军民
    • 摘要: Hyperfine-structure (HFS) of atoms results from the interactions between the nuclear magnetic dipole moment and the magnetic field generated by the electrons (related to the magnetic dipole hyperfine constant Ahfs), and between the nuclear electric quadrupole moment and the electric field gradient due to the distribution of charge within atoms (related to the electric quadrupole hyperfine constant Bhfs), so the accurate measurement of HFS is of interest in many fields, including atomic parity nonconservation, tests of fundamental physics, electron-nucleus interaction, and high resolution spectrum and so on. Generally, in order to obtain the atomic spectra, the frequency of laser needs to be scanned over the hyperfine transitions of atoms, so the nonlinear effect from the laser frequency scanning often limits the measurement accuracy of hyperfine splitting. In this paper, we solve this problem, and demonstrate a novel method to measure the hyperfine splitting of atoms. Taking cesium (Cs) for example, based on the Cs 6S1/2–6P3/2–7S1/2 (852.3 nm +1469.9 nm) ladder-type atomic system, three sets of optical-optical double resonance (OODR) spectra are obtained in a room-temperature vapor cell, when the 852.3 nm laser is tuned to the 6S1/2 (F =4)–6P3/2 (F′=4) resonant transition, and the carriers of 1469.9 nm probe laser accompanied with ±1 sidebands from a phase-type electro-optical modulator (EOM) are scanned over the whole 6P3/2–7S1/2 hyperfine transitions. Owing to the Doppler effect, some of the hyperfine transitions in these three sets of OODR spectra overlap with the narrowest linewidth only when the frequency of the signal driving EOM equals the value of hyperfine splitting 7S1/2 state. Using this phenomenon which can effectively avoid the nonlinear influence on the measurement during the frequency scanning process of 1469.9 nm laser, we measure the hyperfine splitting of 7S1/2 state to be (2183.72±0.23) MHz, and the magnetic dipole hyperfine constant Ahfs to be (545.93±0.06) MHz, which are consistent with previously reported experimental results. This technique provides a robust and simple method of measuring hyperfine splitting with a high precision, which is significant to provide the useful information about atomic structure for developing a more accurate theoretical model describing the interaction within an atom.%在室温下的原子气室中,基于铯原子6S1/2—6P3/2—7S1/2(852.3 nm+1469.9 nm)阶梯型能级系统,利用电光调制器的主频和±1级边带分别产生的三套双共振吸收光谱,当驱动电光调制器的信号源频率严格等于7S1/2态超精细分裂的能级间隔时,三套谱线中的一些超精细跃迁谱线重叠且线宽最窄,利用这一现象很好地避免了激光器频率扫描时非线性效应的影响,测量出了7S1/2态超精细分裂能级间隔:2183.72 MHz ±0.23 MHz,并计算出该态的磁偶极超精细常数: Ahfs=545.93 MHz ±0.06 MHz,与文献中报道的测量结果一致.
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