Ag I Isoelectronic Sequence: Wavelengths and Energy Levels for Ce XII through Ho XXI and for W XXVIII

Sugar, Jack; Kaufman, Victor

doi:10.1088/0031-8949/24/4/010

Cited by 56 publications

(70 citation statements)

References 5 publications

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“…In both AgI and CdIII, Tables 2 and 3, respectively, it is apparent that along the 5s ~ n'p and 6s --, n'p spectral series, the relative difference between the RQDO b and RQDO a results increases, in absolute value, with n', as it should occur: it is a well-known fact that core polarisation effects are always more noticeable in the weaker transitions. This last physical effect is also generally reproduced in our results for the remaining ions presently studied, although in some specific cases, such as the 5s ~ 6p transitions in InlII, SnlV, LaXI, CeXII and PrXIII, and the 6s ~ 6p transitions in LaXI, CeXIII, PrXIII and NdXIV an anomalous behaviour is observed which may be attributed to either cancellation effects in the QDO and/or RQDO transition integrals or to the perturbation that levels from subordinate spectral series are reported to exert on the 4dl°ns series (n: 5,6) [16,[18][19][20].…”

Section: Results and Analysismentioning

confidence: 99%

“…In Moore's [17] energy data, available up to IVII for the present transitions, we only see hints of a possible perturbation by the 4d95s5p level in SnIV. In three more recent parpers than Moore's tables [17], Kaufman and Sugar, who experimentally studied the spectra of IVII through LaXI [18], CeXII through EuXVII [19], and PrXIII [20], report these spectra to have become quite complex due to the rapid increase of the binding energy of the 4d94f 2 configuration, which makes strong transitions to the 4dl°4fZF ground state. In any case [18], the energies of the transitions with no change in principal quantum number (An = 0) vary nearly linearly along the sequence.…”

Section: Computational Proceduresmentioning

confidence: 99%

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Relativistic oscillator strengths for transitions in the principal spectral series of the silver isoelectronic sequence

Martı́n

Almaraz

Lavín

1995

Z Phys D - Atoms, Molecules and Clusters

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Abstract. in a very recent paper [1] we have reported oscillator strengths for fine structure transitions between levels belonging to the diffuse and sharp spectral series in the silver isoelectronic sequence. The calculations were performed with the quantum defect orbital method in both their non-relativistic (QDO) and relativistic (RQDO) formulations, with both implicit and explicit allowance for core-valence polarisation. We now present a parallel study of transitions belonging to the ns 2S-n' ZP(n = 5, 6; n' = 5-10) spectral series of the AgI sequence, up to Z = 63 in some cases.

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Section: Results and Analysismentioning

confidence: 99%

Section: Computational Proceduresmentioning

confidence: 99%

Relativistic oscillator strengths for transitions in the principal spectral series of the silver isoelectronic sequence

Martı́n

Almaraz

Lavín

1995

Z Phys D - Atoms, Molecules and Clusters

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“…This works for both 171 Yb + and 173 Yb + . Note that the electric quadrupole shift due to a Expt., [31]. b Theory, this work.…”

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confidence: 86%

Hyperfine-induced electric dipole contributions to the electric octupole and magnetic quadrupole atomic clock transitions

Dzuba

Flambaum

2016

Phys. Rev. A

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Hyperfine-induced electric dipole contributions may significantly increase probabilities of otherwise very weak electric octupole and magnetic quadrupole atomic clock transitions (e.g. transitions between s and f electron orbitals). These transitions can be used for exceptionally accurate atomic clocks, quantum information processing and search for dark matter. They are very sensitive to new physics beyond the Standard Model, such as temporal variation of the fine structure constant, the Lorentz invariance and Einstein equivalence principle violation. We formulate conditions under which the hyperfine-induced electric dipole contribution dominates. Due to the hyperfine quenching the electric octupole clock transition in 173 Yb + is two orders of magnitude stronger than that in currently used 171 Electric octupole (E3) and magnetic quadrupole (M2) atomic optical transitions, which correspond to transitions between s and f electron orbitals, can be used as optical clocks of exceptionally high accuracy [1][2][3][4][5]. They also present unique opportunities for fundamental research by being sensitive to new physics beyond the Standard Model. The transitions are very sensitive to the temporal variation of the fine structure constant α (α = e 2 /hc) [2][3][4][5][6][7][8][9][10], to the local Lorentz invariance (LLI) violation [11], the effect of dark matter [12][13][14][15][16][17][18], etc. For example, the 4f 14 6s 2 S 1/2 − 4f 13 6s 2 2 F o 7/2 transition in Yb + offers opportunities for frequency measurements with fractional accuracy ∼ 10 −18 [1]. The work is in progress in many laboratories [19][20][21]. Measuring the ratio of frequency of this transition to the frequency of the 4f 14 6s 2 S 1/2 − 4f 14 5d 2 D 3/2 transition in the same ion put the strongest limit on the temporal variation of the fine structure constant and (by including the Cs hyperfine transition) on the proton-to-electron mass ratio [8,9,[22][23][24]. The use of the electric octupole transition in Yb + for the search of LLI violation may lead to five orders of magnitude improvement over current best bounds on the LLI violation in the electron-photon sector [11].Many similar opportunities come with the use of optical transitions in highly-charged ions (HCI) [2][3][4][5]10]. For example, the spectrum of the Ir 17+ ion has been recently measured [25] with the prospect of using the 4f 13 5s 3 F o 4 − 4f 12 5s 2 3 H 6 transition for the time keeping and fundamental research.Electrical octupole and magnetic quadrupole transitions are very weak, typical linewidth can be as small as few nHz. This may lead to certain difficulties in the measurements. In this paper we demonstrate that the electric dipole transition (E1) induced by hyperfine interaction can be significantly larger than the electric octupole or magnetic quadrupole transitions. Therefore, choosing right isotope might be important for the measurements.At least one or more of the following conditions is needed for the domination of the hyperfine-induced E1 transitions.• The hyperfine mixin...

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“…In both sets of spectra, the presence of emission from Ag-and Pd-like Gd 17+ and Gd 18+ , which gives rise to resonance lines near 6.76 and 7.14 nm is clearly evidenced by small intensity peaks in all of the spectra shown in this figure. The spectrum produced by the 10 ns laser pulse is optically thick [10][11][12]. For normal incidence laser irradiation, the spectrum viewed at 45° shows less evidence of absorption at longer wavelengths than that viewed along the surface of the target.…”

mentioning

confidence: 98%

The effect of viewing angle on the spectral behavior of a Gd plasma source near 6.7 nm

O’Gorman

Ôtsuka

Yugami

et al. 2012

Applied Physics Letters

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We have demonstrated the effect of viewing angle on the extreme ultraviolet (EUV) emission spectra of gadolinium (Gd) near 6.7 nm. The spectra are shown to have a strong dependence on viewing angle when produced with a laser pulse duration of 10 ns, which may be attributed to absorption by low ion stages of Gd and an angular variation in the ion distribution. Absorption effects are less pronounced at a 150-ps pulse duration due to reduced opacity resulting from plasma expansion. Thus for evaluating source intensity, it is necessary to allow for variation with both viewing angle and target orientation.

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Ag I Isoelectronic Sequence: Wavelengths and Energy Levels for Ce XII through Ho XXI and for W XXVIII

Cited by 56 publications

References 5 publications

Relativistic oscillator strengths for transitions in the principal spectral series of the silver isoelectronic sequence

Relativistic oscillator strengths for transitions in the principal spectral series of the silver isoelectronic sequence

Hyperfine-induced electric dipole contributions to the electric octupole and magnetic quadrupole atomic clock transitions

The effect of viewing angle on the spectral behavior of a Gd plasma source near 6.7 nm

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