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Using the SuperEBIT electron beam ion trap, we have measured the 2s(1/2)-2p(1/2) transitions in U88+ and U89+. The measured value of 280.645 +/- 0.015 eV for Li-like U89+ improves the available precision by nearly an order of magnitude and establishes a new benchmark for testing the total QED contribution to the transition energy within a fractional accuracy of 3.6 x 10(-4). We infer a value for the 2s two-loop Lamb shift in U89+ of -0.23 eV, from which we estimate a value of -1.27 eV for the 1s two-loop Lamb shift in U91+. 相似文献
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Brandau C Kozhuharov C Müller A Shi W Schippers S Bartsch T Böhm S Böhme C Hoffknecht A Knopp H Grün N Scheid W Steih T Bosch F Franzke B Mokler PH Nolden F Steck M Stöhlker T Stachura Z 《Physical review letters》2003,91(7):073202
The 2s(1/2)-2p(1/2) energy splittings DeltaE(L) of the lithiumlike ions 19779Au76+, 20882Pb79+, and 23892U89+ have been measured at the Experimental Storage Ring, utilizing low energy dielectronic recombination. The resonance energies in total 41 different 1s(2) 2p(1/2)nl(j(')) (n > or =20) autoionizing Rydberg states populated in the dielectronic capture process have been determined. The 2s(1/2)-->2p(1/2) excitation energies have been obtained by extrapolation of these resonance energies to the associated series limits n--> infinity. The combined analysis of the experimental data for all three ions yields DeltaE(L)=216.134(96) eV for Au76+, 230.650(81) eV for Pb79+, and 280.516(99) eV for U89+. 相似文献
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用多组态Dirac-Fock方法,并系统考虑相对论效应、电子关联、弛豫效应等重要贡献,计算了NII离子2s22p3s 3P1—2s22p21D2和2s22p3s 1P1—2s22p23P0,1,2自旋禁戒跃迁概率和振子强度-通过比较计算证实:弛豫和关联效应对禁戒跃迁概率的影响非常大,考虑了这些效应后,计算结果有显著的改善-由跃迁概率和振子强度的计算值推断,2s22p3s 3P1—2s22p21D2的谱线强度应该比原有的理论预言值小-
关键词:
跃迁概率
多组态Dirac-Fock方法 相似文献
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Helium ions were produced in then=4 states by electron collisions with ground state atoms, resulting in simultaneous ionization and excitation. Dipole transitions between the Zeeman levels of the states 42 S 1/2 and 42 P 1/2 were induced by a microwave electric field. The intensity of the emitted Fowlerα line 4686 Å, corresponding to transitions from then=4 to then=3 states was then reduced by about 3%. From the measurements, a value of the Lamb shiftδ=1751±25 MHz was obtained, compared with the theoretical valueδ=1768.23±0.55 MHz, and the results ofLea, Leventhal andLamb ofδ=1765±20 MHz. 相似文献
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Theoretical lifetimes and fluorescence yields for the 1s2p 3P levels are presented for selected atomic numbers up to Z=50. 相似文献
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用多组态Dirac-Fock和相对论组态相互作用的扩展优化能级方法,在计算中包含了Breit相互作用,真空极化,自能以及有限核质量修正,计算了核电荷数从Z=6到80的类铍离子等电子序列的1s22s2p 3P1, 2的精细结构能级,磁偶极跃迁几率和振子强度。结果与目前可靠的结果在其不确定度范围内符合得很好,另外也得到一些与其他早期理论计算不同的结果。 相似文献
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Using colinear fast-beam laser spectroscopy with copropagating and counter-propagating beams we have measured the 1s2s 1S0-1s2p 3P1 intercombination interval in 28Si12+ with the result 7230.585(6) cm{-1}. The experiment made use of a dual-wavelength, high-finesse, power build-up cavity excited by single-frequency lasers at 1319 and 1450 nm. The result will provide a precision test of ab initio relativistic many-body atomic theory at moderate Z. 相似文献
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Peter Beiersdorfer Klaus Widmann José Crespo López-Urrutia 《Hyperfine Interactions》1998,114(1-4):141-146
The measurement of the Bi80+ 2s1/2−2p3/2 transition energy is discussed. The measurement resolved the hyperfine splitting of the (1s22s) F=4,5 ground configuration and allowed a determination of the Lamb shift contributions with a precision of about 9 × 10-4 providing the most accurate test of QED in a high-Z ion to date.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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D. Zimmermann P. Zimmermann G. Aepfelbach A. Kuhnert 《Zeitschrift für Physik A Hadrons and Nuclei》1980,295(4):307-310
Using a tunable single mode dye laser the isotope shift of the 573.7 nm-line between the isotopes Lu175 and Lu176 has been determined to be IS(176?175, 573.7 nm)=?394(5) MHz yielding a change of mean square nuclear radii ofδ〈r 2〉=0.022(5) fm2. In addition from our measurements the following values of the hyperfine splitting constantsA andB could be deduced Lu176 5d6s6p 4 F 3/2:A=?651.4(0.3) MHz,B=2,494(4) MHz 5d6s 2 2 D 3/2:A=138.0(0.3) MHz,B=2,131(3) MHz Lu175 5d6s6p 4 F 3/2:A=?924.7(0.5) MHz,B=1,767(4) MHz. 相似文献
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Summary We report the measurements of the3
D(3s4d)-3
P(3s3p)3
D(3s5d)-3
P(3s3p), and3
P(3p
2)-3
P(3s3p) transition frequency of MgI, the fine-structure separation and isotope shift between24Mg and26Mg. The measurements have been performed in a metastable atomic beam; a good agreement is found for data already existing
in the literature. The accuracy of the measurements reported in this paper is mainly limited by the Doppler broadening of
theI
2 transitions used as a reference and by the precision in the knowledge of the related wavelengths. 相似文献
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利用全相对论性多组态Dirac-Fock平均能级(MCDF-AL)方法系统地计算 了高离化类镁离子3s21S0-3s3p1P1(Z=15~103)跃迁的能级间隔和 跃迁几率,计算中考虑了重要的核有限体积效应,Breit修正和QED修正,所得结果和最近的 实验数据及其它理论计算值进行了比较。 相似文献
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Jiang Zhan-Kui H. Lundberg S. Svanberg 《Zeitschrift für Physik A Hadrons and Nuclei》1982,306(1):7-10
The hyperfine structure of the 8p 2 P 3/2 and2 P 1/2 levels of115In was measured using high-resolution laser spectroscopy on a collimated indium atomic beam. Step-wise excitations from the metastable 52 P 3/2 state via the shortlived 6s 2 S 1/2 state were employed. For the magnetic-dipole and electric-quadrupole interaction constantsa andb, respectively, the following results were obtained:a(8p 2 P 3/2)=16.3 (3) MHz,b(8p 2 P 3/2)=11 (3) MHz anda(8p 2 P 1/2)=44.0 (5) MHz. The magnetic hyperfine structure is shown to be strongly influenced by core polarization. For the electric-quadrupole moment of115In the valueQ=0.79 (20) barn is deduced. 相似文献
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We report the observation of amplified spontaneous emission on the J = 2 → 1, 3p-3s transition (C-line) of neonlike argon at 69.78 nm in capillaries of 6-mm bore. The simple discharge is driven by a small capacitor bank having a capacitance of 0.1 μF. Gain coefficients between G = 0.17 cm−1 and G = 0.25 cm−1 are derived. 相似文献