Forbidden 
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 and 
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 transitions in monovalent atoms and ions

Safronova, U. I.; Safronova, M. S.; Johnson, W. R.

doi:10.1103/physreva.95.042507

Cited by 22 publications

(37 citation statements)

References 76 publications

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“…It was demonstrated in Ref. [16] that M1 transition rates are larger by factor of 10 -100 than E2 contributions. As a result, we present in Table IV,the M1 transition rate for 20 transitions in Ho 19+ , Er 20+ , and Tm 21+ ions.…”

Section: Calculationsmentioning

confidence: 97%

“…The CI+all-order (SD) approach described in Ref. [16] was applied in this study for calculating the energies, wavelengths, and transition rates of low-lying levels in Cd-like Ho 19+ , Er 20+ , and Tm 21+ ions. Table II shows the energies for all the fine structure levels of 4f 2 configuration.…”

Section: Calculationsmentioning

confidence: 99%

“…For example, visible spectra of W ions have been extensively studied with electron beam ion traps (EBITs) [13,14]. Theoretical analysis for identifying those experimental spectra has also been performed [15,16]. For the visible transitions useful for an atomic clock, theoretical studies [2,8,12] have taken a lead role, and several experimental efforts [17,18] to identify the proposed transitions have followed the theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

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Visible transitions in Ag-like and Cd-like lanthanide ions

et al. 2017

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We present visible spectra of Ag-like ($4d^{10}4f$) and Cd-like ($4d^{10}4f^2$) ions of Ho (atomic number $Z=67$), Er (68), and Tm (69) observed with a compact electron beam ion trap. For Ag-like ions, prominent emission corresponding to the M1 transitions between the ground state fine structure splitting $4f_{5/2}$--$4f_{7/2}$ is identified. For Cd-like ions, several M1 transitions in the ground state configuration are identified. The transition wavelength and the transition probability are calculated with the relativistic many-body perturbation theory and the relativistic CI + all-order approach. Comparisons between the experiments and the calculations show good agreement

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Section: Calculationsmentioning

confidence: 97%

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visible transitions in Ag-like and Cd-like lanthanide ions

et al. 2017

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“…Comparing results for two different values of the pitch angle θ k we find that the rate is smaller for smaller θ k , which can be understood as the effect of Wigner functions in Eqs. (16,20). The use of BG profile suppresses the rate on beam periphery, but does not affect relative contributions of M1 and E2 multipoles.…”

Section: Plane Wavementioning

confidence: 99%

Atomic spectroscopy with twisted photons: Separation of M1−E2 mixed multipoles

2018

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We analyze atomic photoexcitation into the discrete states by twisted photons, or photons carrying extra orbital angular momentum along their direction of propagation. From the angular momentum and parity considerations, we are able to relate twisted-photon photoexcitation amplitudes to their plane-wave analogues, independently of the details of the atomic wave functions. We analyzed the photo-absorption cross sections of mixed-multipolarity E2 − M1 transitions in ionized atoms and found fundamental differences coming from the photon topology. Our theoretical analysis demonstrates that it is possible to extract the relative transition rates of different multipolar contributions by measuring the photo-excitation rate as a function of the atom's position (or the impact parameter) with respect to the optical vortex center. The proposed technique for separation of multipoles can be implemented if the target's atom position is resolved with sub-wavelength accuracy, for example, with Paul traps. Numerical examples are presented for Boron-like highly-charged ions (HCI).

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“…The agreement is satisfactory except for the value of β(M 1) for EB from the initial state 5f 5/2 to the final state 7s 1/2 , where the values differ by a factor 2.5. We consider this issue not critical for our purposes espe-cially taking into account the significant disagreement in RPA calculations for M 1 matrix elements present in literature [46,47]. The small deviations of the E2 rates can be attributed to the RPA corrections included in Ref.…”

Section: Eb In Th Ionsmentioning

confidence: 98%

Electric quadrupole channel of the 7.8 eV Th229 transition

2018

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The unique isomeric transition at 7.8 eV in 229 Th has a magnetic dipole (M 1) and an electric quadrupole (E2) multipole mixing. So far, the E2 component has been widely disregarded. Here, we investigate the nuclear physics nature and the impact of the E2 decay channel for the nuclear coupling to the atomic shell based on the newest theoretical predictions for the corresponding reduced nuclear transition probabilities. Our results show that the contribution of the E2 channel is dominant or at least of the same order of magnitude for internal conversion or electronic bridge transitions involving the atomic orbitals 7p, 6d and 5f . Notable exceptions are the internal conversion of the 7s electron and the electronic bridge between the electronic states 7s and 7p, for which the M 1 component dominates by two to three orders of magnitude. Caution is therefore advised when considering isomeric excitation or decay via nuclear coupling to the atomic shell, as the involved orbitals determine which multipole transition component dominates. * Electronic address: Pavlo.Bilous@mpi-hd.mpg.de † Electronic address: nminkov@inrne.bas.bg ‡ Electronic address: Palffy@mpi-hd.mpg.de

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Forbidden M1 and E2 transitions in monovalent atoms and ions

Cited by 22 publications

References 76 publications

Visible transitions in Ag-like and Cd-like lanthanide ions

Visible transitions in Ag-like and Cd-like lanthanide ions

Atomic spectroscopy with twisted photons: Separation of M1−E2 mixed multipoles

Electric quadrupole channel of the 7.8 eV Th229 transition

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