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少电子原子的精密光谱在基本物理理论验证、精细结构常数精确测定以及原子核性质深入探索等领域具有重要的应用价值. 随着精密测量物理学的快速发展, 人们对原子结构数据的需求已从最初的存在性确认, 转变为对高度准确性和精确性的持续追求. 为了满足精密光谱实验对高精度结构性质数据的迫切需求, 我们自主发展了一系列基于B-样条基组的高精度理论方法, 并将其成功应用于少电子原子的能级结构与外场响应性质的理论研究中. 具体而言, 我们实现了氦原子和类氦离子能谱的高精度确定, 为相关实验研究提供理论支撑; 实现了幻零波长的高精度理论预言, 为量子电动力学理论检验开辟了新方向; 提出了有效抑制光频移的理论方案, 为氦原子高精度光谱实验的开展提供了重要支持. 展望未来, 基于B-样条基组的高精度理论方法有望在量子态操控、核结构性质精确测定、超冷分子形成以及新物理探索等前沿领域得到广泛应用, 从而进一步促进国内外精密测量物理领域的蓬勃发展.The precise spectroscopy of few-electron atoms plays a pivotal role in advancing fundamental physics, encompassing the verification of quantum electrodynamics (QED) theory, the determination of fine-structure constants, and the exploration of nuclear properties. With the rapid development of precision measurement techniques, the demand for atomic structure data has evolved from mere confirmation of existence to the pursuit of unprecedented accuracy. To meet the growing needs for precision spectroscopy experiments, we have developed a series of high-precision theoretical methods based on B-spline basis sets, including the non-relativistic configuration interaction (B-NRCI) method, the correlated B-spline basis functions (C-BSBFs) method, and the relativistic configuration interaction (B-RCI) method. These methods leverage the unique properties of B-spline functions, such as locality, completeness, and numerical stability, to accurately solve the Schrödinger and Dirac equations for few-electron atoms. Our methods have yielded significant results, particularly for helium and helium-like ions. Using these methods, we have obtained accurate energies, polarizabilities, tune-out wavelengths, and magic wavelengths. Specifically, we have achieved high-precision determinations of the energy spectra of helium, providing vital theoretical support for related experimental research. Additionally, we have made high-precision theoretical predictions of tune-out wavelengths, paving the way for new tests of QED theory. Furthermore, we have proposed effective theoretical schemes to suppress Stark shifts, thereby facilitating high-precision spectroscopy experiments of helium. The B-spline-basis methods reviewed in this paper have proven exceptionally effective in high-precision calculations for few-electron atoms. These methods have not only provided crucial theoretical support for precision spectroscopy experiments but have also paved new avenues for testing QED. Their ability to handle large-scale configuration interactions and incorporate relativistic and QED corrections makes them versatile tools for advancing atomic physics research. In the future, the high-precision theoretical methods grounded in B-spline basis sets are poised to expand into frontier areas, including quantum state manipulation, nuclear structure property determination, ultracold molecule formation, and new physics exploration, thereby continuously driving the progress of precision measurement physics.
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Keywords:
- B-spline basis sets /
- few-electron atoms /
- polarizabilities /
- Bethe-logarithm
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表 1 无穷核质量下, 氦原子基态非相对论能量(原子单位)随最大分波数$ \ell_{max}$增加的收敛性检验
Table 1. Convergence test for the non-relativistic energy (in a.u.) of ground-state helium with infinite nuclear mass, as the maximum partial wave $ \ell_{max}$ increases.
表 2 加速度规范下, 氢原子基态贝特对数项$\beta(1 s)$(原子单位)随指数结点参数$\gamma_0$的变化. 其中, $t_1$为第一个非零结点, $E_{max}$为中间态的最大能量值. 在计算过程中, 样条个数$N=300$, 样条阶数$k=15$, 盒子半径$R_0=200$个原子单位
Table 2. Values of the Bethe logarithm $\beta(1 s)$ (in a.u.) for the ground-state hydrogen in the acceleration gauge, evaluated at different knot sequences. Where $\gamma_0$ denotes the parameter of exponential knot sequences, $t_1$ represents the first interior knot point, and $E_{max}$ indicates the highest energy. All calculations are carried out using the same set of parameters: N = 300, k = 15, and $R_0$=200 a.u.
$ \gamma_0 $ $ t_1 $ $ E_{max} $ $ \beta(1 s) $ 0.005 4.10 × 10–1 5.76 × 103 2.258 0.025 2.41 × 10–2 1.59 × 106 2.2890 0.035 4.59 × 10–3 4.32 × 107 2.29061 0.045 8.06 × 10–4 1.38 × 109 2.290915 0.065 2.17 × 10–5 1.83 × 1013 2.2909796 0.075 3.43 × 10–7 7.23 × 1015 2.29098109 0.085 5.32 × 10–7 2.96 × 1018 2.290981330 0.105 1.23 × 10–9 5.38 × 1020 2.2909813741 0.115 1.84 × 10–10 2.36 × 1022 2.29098137505 0.125 2.74 × 10–10 1.05 × 1023 2.29098137518 0.135 4.04 × 10–11 4.75 × 1023 2.2909813752020 0.145 5.94 × 10–12 2.16 × 1025 2.29098137520502 0.165 1.26 × 10–13 4.65 × 1028 2.290981375205541 0.175 1.83 × 10–14 2.17 × 1030 2.2909813752055506 0.185 2.65 × 10–15 1.03 × 1032 2.29098137520555206 0.195 3.82 × 10–16 4.86 × 1033 2.29098137520555227 0.205 5.49 × 10–17 2.32 × 1035 2.290981375205552296 0.225 1.13 × 10–18 5.35 × 1038 2.29098137520555230124 0.235 1.60 × 10–19 6.31 × 1039 2.2909813752055523013355 表 3 不同方法计算得到的氦原子$n\, ^1 S(n= 1- $$ 7)$态贝特对数的比较. 第二列和第三列的第一项数据来自加速度规范, 而第二项数据来自速度-加速度混合规范. 括号中的数字表示计算结果的不确定度
Table 3. Comparison of Bethe logarithms for the $n\, ^1 S(n=1-7)$ states of helium obtained from different methods. The first entries in the second and third columns are from the acceleration gauge, while the second entries are from the mixed velocity-acceleration gauge. The Numbers in parentheses represent the computational uncertainties.
State B-NRCI [65] C-BSBFs [55] Integration method [73] $ 1\, ^1 S $ 4.37034(2) 4.37016022(5) 4.3701602230703(3) 4.37014(2) 4.3701601(1) $ 2\, ^1 S $ 4.36643(1) 4.36641271(1) 4.366412726417(1) 4.366412(1) 4.3664127(1) $ 3\, ^1 S $ 4.369170(1) 4.36916480(6) 4.369164860824(2) 4.3691643(2) 4.3691648(1) $ 4\, ^1 S $ 4.369893(1) 4.36989065(5) 4.369890632356(3) 4.3698903(5) 4.3698906(1) $ 5\, ^1 S $ 4.370152(3) 4.3701520(1) 4.370151796310(4) 4.3701511(2) 4.3701519(1) $ 6\, ^1 S $ 4.37027(1) 4.370267(1) 4.370266974319(5) 4.370266(2) 4.370267(1) $ 7\, ^1 S $ 4.37033(1) 4.370326(1) 4.370325261772(5) 4.37033(1) 4.370326(1) 表 4 氦–4原子基态静电偶极极化率(原子单位)的结果比较. “NR”表示非相对论极化率, “Rel.”表示相对论极化率, “Total”表示考虑QED修正后的最终极化率. 括号中的数字表示计算结果的不确定度
Table 4. Comparison of the static dipole polarizability $\alpha_1(0)$ (in a.u.) for the ground state of 4He. “NR” denotes the non-relativistic polarizability, “Rel.” represents the relativistic polarizability, and “Total” stands for the final polarizability including QED corrections. The Numbers in parentheses indicate the computational uncertainties.
表 5 关联B-样条基组方法计算的氦–4原子$n\, ^1 S_0(n=2-7)$和$n\, ^3 S_1(n=2-7)$激发态的静电偶极极化率(原子单位). 对于$n\, ^3 S_1$态的张量极化率, 斜杠前的数值对应于$n\, ^3 P_{0, 1, 2}$中间态的贡献, 斜杠后的数值对应于$n\, ^3 D_1$中间态的贡献. 括号中的数字为计算结果的不确定度
Table 5. Static dipole polarizabilities (in a.u.) calculated using the correlated B-spline basis sets for the excited $n\, ^1 S_0(n=2-7)$ and $n\, ^3 S_1(n=2-7)$ states of $^4$He. For the tensor polarizability of the $n\, ^3 S_1$ states, the number before the slash corresponds to the contribution from the $n\, ^3 P_J$ intermediate states, and the number after the slash corresponds to the contribution from the $n\, ^3 D_1$ intermediate states. Numbers in parentheses represent computational uncertainties.
n $ \alpha_1(n\, ^1 S_0) $ $ \alpha_1^S(n\, ^3 S_1) $ $ \alpha_1^T(n\, ^3 S_1) $ 2 800.521 95(14) 315.728 536(48) 0.002 764 488(2)/0.000 726 892(6) 3 16 890.527 5(28) 7 940.549 4(13) 0.097 155 09(3)/–0.005 470(2) 4 135 875.295(23) 68 677.988(11) 0.955 8(3)/–0.118 9(2) 5 669 694.55(11) 351 945.328(60) 5.267 6(2)/–0.782 9(3) 6 2 443 625.15(40) 1 315 529.52(23) 20.654(3)/–3.291(2) 7 7 269 026.8(1.2) 3 977 532.95(69) 64.62(3)/–10.65(3) 表 6 在激光偏振与量子轴夹角不同的情形下, 氦原子413 nm幻零波长(纳米单位)的结果比对. 第三列代表偏振方向与量子轴平行, 且初态磁量子数$M_J=0$时的情况; 第四列代表偏振方向与量子轴平行, 且初态磁量子数为$M_J=\pm 1$时的情况; 第五列代表偏振方向与量子轴垂直, 且初态量子数$M_J=\pm 1$时的情况
Table 6. Comparison of the 413 nm tune-out wavelength (in nm) for the $2\, ^3 S_1$ state of 4He, with varying the initial magnetic quantum number$M_J$ values, under different angles between laser polarization and the quantization axis. The third column represents the case where the polarization direction is parallel to the quantization axis and $M_J=0$. The fourth column represents the case where the polarization direction is parallel to the quantization axis but with $M_J=\pm 1$. The fifth column represents the case where the polarization direction is perpendicular to the quantization axis, with $M_J=\pm 1$.
Reference Method $ \alpha_1^S(\omega)-2\alpha_1^T(\omega) $ $ \alpha_1^S(\omega)+\alpha_1^T(\omega) $ $ \alpha_1^S(\omega)-\frac{1}{2}\alpha_1^T(\omega) $ Ref. [6] Hybrid model 413.02(9) Ref. [89] Expt. 413.0938(9$ _{stat} $)(20$ _{syst} $) Ref. [47] RCI 413.080 1(4) 413.085 9(4) Ref. [49] RCI+NRQED 413.084 26(4) 413.090 15(4) Ref. [15] Expt. 413.087 08(15) Ref. [15] NRQED 413.087 179(6) Ref. [90] RCIRP 413.084 28(5) 413.090 17(3) 413.087 23(3) 表 7 氦原子$2\, ^3 S\rightarrow 2\, ^1 S$双禁戒跃迁下319.8 nm魔幻波长理论与实验的对比
Table 7. Comparison of the 319.8 nm magic wavelength between theory and experiment for the doubly forbidden transition $2\, ^3 S\rightarrow 2\, ^1 S$ of helium.
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