原子光谱中同位素位移和超精细结构分裂

利用共线快离子束-激光光谱学方法测量了钕离子所有7个稳定同位素(A=142～146,148,150)之间的同位素位移和两个奇同位素(A=143,145)的超精细结构分裂．     

~(159)TbII超精细结构光谱测量

利用具有光谱高分辨和选择性激发等特点的共线快离子束激光光谱学方法研究了159Tb II亚稳态 4 f95 d7H08和激发态 4 f96 p3 / 2 ( 1 5 /2 ,3/2 )的超精细结构光谱 ,所有光谱线可以很好地分辨 ;并由实验测量到的高分辨超精细结构光谱 ,给出了相应能级的超精细结构常数     

单晶LiNbO3:Mn2+的ESR谱研究

用室温电子自旋共振(ESR)实验研究单晶LiNbO3中Mn2+的精细结构和超精细结构.对ESR谱的分析得出,零磁场的能级分裂数值:自旋角动量能级|±1/2>与|±3/2>之间的间隔为△ε1=-587×10-4cm-1,而|±3/2>与|±5/2>之间的能级间隔为△ε2=-2633×10-4cm-1;其各向异性朗德因子g//=2.1810,g⊥=2.0937;精细结构常数D=-536×10-4cm-1;超精细结构常数A//=88.36×10-4cm-1,A⊥=81.20×10-4cm-1,即精细结构相互作用要比超精细结构相互作用大得多.另外,特别值得提到的是实验中还发现两组明显的禁戒跃迁,|-3/2> |1/2>和|-1/2> |5/2>.     

^139LaⅠ超精细结构光谱测量

本文用激光光电流光谱方法研究了~(139)LaI五个奇宇称能级的超精细结构,其中三个是首次报道.采用最小二乘拟合,得到了这些能级的磁偶极超精细结构常数A.     

159TbII超精细结构光谱测量

利用具有光谱高分辨和选择性激发等特点的共线快离子束激光光谱学方法研究了^159TbⅡ亚稳态4f^95d^7H8^0和激发态4f^96p3/2(15/2,3/2)的超精细结构光谱，所有光谱线可以很好地分辨；并由实验测量得到的高分辨超精细结构光谱，给出了相应能级的超精细结构常数。     

NiI［14. 6］2Δ5/2-X 2Δ5/2（9，0）带的超精细结构

在可见光范围内 ,用激光蒸发 /反应、超声射流和激光诱导荧光光谱方法 ,对NiI[14 .6 ]2 △5/ 2 -X2 △5/ 2跃迁的 (9,0 )带进行了高分辨研究 .80MHz分辨的光谱显示超精细结构是由于激发态中未成对电子与碘 (I=5 /2 )核大磁矩相互作用引起的 .在v =9能级上低J谱线的超精细线宽快速下降 ,表明在 [14 .6 ]2 △5/ 2 态中超精细耦合适合Hundaβ 耦合情况 .[14 .6 ]2 △5/ 2 态的精确转动参数和超精细参数已得到 ,而且显示v =9能级被微扰了 .     

电子束离子阱光谱标定和Ar13+离子M1跃迁波长精密测量

高电荷态离子精细结构跃迁波长的精密测量不仅可以检验量子电动力学(quantum electrodynamics,QED)效应、电子关联效应等基本物理模型,还能够为天体物理、聚变等离子体物理甚至高电荷态离子光钟等研究提供关键原子物理数据.本工作基于复旦大学现代物理研究所的高温超导电子束离子阱(SH-HtscEBIT)装置,搭建了一套新的光谱校刻系统,并结合内校刻与外校刻的方法对其光谱波长测量的不确定度进行了评估,新的光谱校刻系统在可见光波段引起的波长不确定度最低达到0.002 nm.在此基础上,使用SH-HtscEBIT装置结合新的校刻系统开展了Ar¹³⁺离子1s²2s²2p²P_1/2-²P_3/2磁偶极跃迁(M1)波长的精密测量,实验测得该跃迁波长为(441.2567±0.0026)nm,是目前SH-HtscEBIT上测量精度最高的实验结果,为下一步开展高电荷态离子超精细分裂和同位素位移等精密测量实验奠定了基础.     

Hg~+离子5d~(10)6s ~2S_(1/2)→5d~96s~2 ~2D_(5/2)钟跃迁同位素位移和超精细结构的理论研究

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.     

~(143,145)Nd~+4f~45d~6K_(9/2)→(23229.991)_(9/2)~o跃迁超精细结构光谱

利用共线快离子束 激光光谱学方法测量了1 4 3 ,1 4 5Nd+6K9/ 2 → (2 32 2 9.991 ) o9/ 2 跃迁的超精细结构光谱 ,得到了上、下能级的超精细相互作用常数 .     

单晶LiNbO3:Mn2+的ESR谱研究

用室温电子自旋共振（ESR）实验研究单晶LiNbO3中Mn2+的精细结构和超精细结构.对ESR谱的分析得出,零磁场的能级分裂数值：自旋角动量能级±12〉与±32〉之间的间隔为Δε1=-587×10-4cm-1,而±32〉与±52〉之间的能级间隔为Δε2=-2633×10-4cm-1；其各向异性朗德因子g∥=21810，g⊥=20937；精细结构常数D=-536×10-4cm-1；超精细结构常数A∥=8836×10-4cm-1，A⊥=8120×10-4cm-1，即精细结构相互作用要比超精细结构相互作用大得多.另外，特别值得提到的是实验中还发现两组明显的禁戒跃迁，-32〉12〉和-12〉52〉. 关键词： 单晶 精细结构 超精细结构 禁戒跃迁     

Isotope shifts and hyperfine structure of erbium,dysprosium, and gadolinium by atomic-beam diode-laser spectroscopy

A commercial diode laser system, without external frequency stabilization, has been used to study the isotope shifts and hyperfine structure in a near infrared transition of erbium, dysprosium and gadolinium. Specific mass shifts and relative values for the change in the radial nuclear charge parameters of the isotopes were obtained for erbium and dysprosium that compare well with literature values. The hyperfine structure constants measured for erbium fell within the range predicted from the results of other workers. The isotope shifts in the gadolinium transition investigated were too small for the spectrum to be resolved.     

Hyperfine structure and isotope shift of highly excited barium-I states

High-resolution laser-spectroscopy measurements of hyperfine structure and isotope shifts were performed for the 6snd ¹ D ₂ sequence of Ba-I in the regionn=12–24. Stepwise laser excitations of a collimated atomic beam were used. A strong influence on the hyperfine structure is observed at the perturbation atn=14, caused by interaction with the 5d7d configuration. Whereas the isotope shift for the even isotopes stays essentially constant with increasingn, the odd isotopes exhibit a strong change, indicating hyperfine-induced shifts.     

Isotopes through the looking glass

Nuclear distributions affect many aspects of atomic spectra. As an example, recent experimental results for the hyperfine anomaly in Fr isotopes are considered. These depend on nuclear charge and magnetization distributions. The variations in charge radii for these isotopes were studied earlier by measuring optical isotope shifts. The hyperfine anomalies for the odd-odd isotopes involve the neutron distributions, of interest for studies of parity nonconserving effects along a chain of isotopes. This revised version was published online in August 2006 with corrections to the Cover Date.     

Analysis of optical isotope shifts in cadmium

An interpretation is given of published measurements of optical isotope shifts in cadmium. This requires the evaluation of two electronic factors for each transition; these are found for the alkali-like transitions γγ226.5, 806.7 and 853.3 nm of Cd II using data from hyperfine structure and evidence from atomic calculations. The King relations then allow the electronic factors for γ1441.6 nm to be derived. Finally, the precise measurements of isotope shifts in this transition are analysed to investigate how the nuclear charge distribution changes over the range of stable isotopes.     

142—146,148,150Nd+同位素位移的共线快离子束激光光谱学实验研究

原子光谱中,同位素位移是少数几个能够将原子物理学和原子核物理学这两个不同的物理学分支联系起来的课题之一.本文利用共线快离子束激光光谱学方法,测量了正一价钕离子所有7个稳定同位素(A=142—146,148,150)之间的能量位移.与已有的结果比较,测量精度提高了一个数量级 关键词： 同位素位移 快离子束激光光谱学     

~(142—146,148,150)Nd~ 同位素位移的共线快离子束激光光谱学实验研究

原子光谱中 ,同位素位移是少数几个能够将原子物理学和原子核物理学这两个不同的物理学分支联系起来的课题之一 .本文利用共线快离子束 激光光谱学方法 ,测量了正一价钕离子所有 7个稳定同位素 (A =142— 146 ,148,15 0 )之间的能量位移 .与已有的结果比较 ,测量精度提高了一个数量级     

Observation of one correlatedα-decay in the reaction58Fe on209Bi→267109

We report laser spectroscopic measurements of isotope shifts and hyperfine structure in ten stable and unstable lead isotopes, including two not previously measured.     

A muonic X-ray study of the charge distribution of 144, 148, 150, 152, 154Sm

We report the measurement of the energies of the 4f → 3d, 3d → 2p and 2p → Is muonic atomic transitions in separated isotopes of ^{144, 148, 150, 152, 154}Sm, and that of the 2s → 2p transitions of ¹⁵²Sm as well. Using these transition energies as well as the hyperfine splittings of the 2p levels, we have interpreted our data in terms of a deformed Fermi distribution for the charge density and obtained good fits. A model independent analysis of the isotope shifts in terms of generalized R_h moments has been made and is in good agreement with electronic X-ray and optical isotope shifts. The static quadrupole moments and the isomer shifts of the first excited state of ^{152, 154}Sm have been determined from the 2p hyperfine structure.     

Isotope shift and hyperfine structure of the highly excited atomic uranium

The laser induced fluorescence method using atomic beam combined with Doppler-free two-photon absorption technique was applied for the measurement of isotope shifts and hyperfine structures of atomic uranium including ²³⁴U, ²³⁵U, ²³⁶U and ²³⁸U isotopes. The isotope shifts between ²³⁸U-²³⁴U, ²³⁸U-²³⁵U, ²³⁸U-²³⁶U, and the hyperfine structure of ²³⁵U were obtained in the high lying odd levels around 4 eV. Received 3 December 2001 / Received in final form 4 July 2002 Published online 29 October 2002 RID="a" ID="a"e-mail: oba@analchem.tokai.jaeri.go.jp