The Spectra of Y V and Zr VI

Paul, Fred W.; Rense, W. A.

doi:10.1103/physrev.56.1110

Cited by 19 publications

(16 citation statements)

References 6 publications

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“…The corresponding compiled energies of NIST are also provided in the tables to facilitate comparison. Furthermore, the level orderings in these tables are the same as those by Singh et al, even though our calculations and the NIST compilations differ in a few instances -see for example, levels 29 and 30 of Zr VI in table 4. We also note that the identification of these 31 levels for ions with 38 ≤ Z ≤ 42 is not as difficult as was the case for another Br-like ion, i.e.…”

Section: Energy Levelssupporting

confidence: 62%

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Aggarwal¹,

Keenan²

2014

Phys. Scr.

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Energy levels and radiative rates for transitions in five Br-like ions (Sr IV, Y V, Zr VI, Nb VII and Mo VIII) are calculated with the general-purpose relativistic atomic structure package (grasp). Extensive configuration interaction has been included and results are presented among the lowest 31 levels of the 4s 2 4p 5 , 4s 2 4p 4 4d and 4s4p 6 configurations. Lifetimes for these levels have also been determined, although unfortunately no measurements are available with which to compare. However, recently theoretical results have been reported by Singh et al [Phys. Scr. 88 (2013) 035301] using the same grasp code. But their reported data for radiative rates and lifetimes cannot be reproduced and show discrepancies of up to five orders of magnitude with the present calculations.

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Section: Energy Levelssupporting

confidence: 62%

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Aggarwal¹,

Keenan²

2014

Phys. Scr.

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“…Five-times-ionized zirconium, Zr VI, is isoelectronic with neutral Br. The ground state is 4s 2 4p 5 2 P, and excited states are mainly of the type 4s 2 4p 4 n l. The first work on this spectrum was done by Paul and Rense [1]. From their observation of transitions to the ground term, they determined the 4p 5 2 P interval as well as the first excited state 4s4p 6 2 S 1/2 and several levels of the 4p 4 4d and 4p 4 5s configurations.…”

Section: Introductionmentioning

confidence: 99%

Spectrum and energy levels of five-times ionized zirconium (Zr VI)

Reader

Lindsay

2016

Phys. Scr.

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We carried out a new analysis of the spectrum of five-times-ionized zirconium Zr VI. For this we used sliding-spark discharges together with normal- and grazing-incidence spectrographs to observe the spectrum from 160 to 2000 Å. These observations showed that the analysis of this spectrum by Khan Z. A. et al. 1985 Phys. Scr. 31 837 contained a significant number of incorrect energy levels. We have now classified ∼420 lines as transitions between 23 even-parity levels 73 odd-parity levels. The 4s24p5, 4s4p6, 4s24p44d, 5s, 5d, 6s configurations are now complete, although a few levels of 4s24p45d are tentative. We determined Ritz-type wavelengths for ∼135 lines from the optimized energy levels. The uncertainties range from 0.0003 to 0.0020 Å. Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels were used to interpret the observed configurations. Oscillator strengths for all classified lines were calculated with the fitted parameters. The results are compared with values for the level energies, percentage compositions, and transition probabilities from recent ab initio theoretical calculations. The ionization energy was revised to 777380±300 cm-1 (96.38±0.04 eV).

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“…Nanoscale ferroelectrics are different from bulk ferroelectrics mainly because strain and electrostatics such as depolarizing fields play a much more relevant role, but even in the absence of depolarizing fields the long range Coulombian interaction is modified and thickness dependences appear. [1][2][3] Depolarizing fields, created by unscreened charges at the interfaces, put the system in a non-equilibrium state, and are one of the main reasons of polarization instability. 2,4 Thus, at the nanoscale and under appropriate strain and electrostatic conditions, polar configurations beyond the classical ones may be attained.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Depolarizing fields, created by unscreened charges at the interfaces, put the system in a non-equilibrium state, and are one of the main reasons of polarization instability. 2,4 Thus, at the nanoscale and under appropriate strain and electrostatic conditions, polar configurations beyond the classical ones may be attained. [5][6][7][8] In this regard, the balance of competing energies (elastic, electric, polarization gradient, etc.)…”

Section: Introductionmentioning

confidence: 99%

Rotational polarization nanotopologies in BaTiO₃/SrTiO₃ superlattices

et al. 2019

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Ferroelectrics are characterized by domain structures as are other ferroics. At the nanoscale though, ferroelectrics may exhibit non-trivial or exotic polarization configurations under proper electrostatic and elastic conditions. These polar states may possess emerging properties not present in the bulk compounds and are promising for technological applications. Here, the observation of rotational polarization topologies at the nanoscale by means of aberration-corrected scanning transmission electron microscopy is reported in BaTiO 3 /SrTiO 3 superlattices grown on cubic SrTiO 3 (001). The transition from a highly homogeneous polarization state to the formation of rotational nanodomains has been achieved by controlling the superlattice period while maintaining compressive clamping of the superlattice to the cubic SrTiO 3 substrate. The nanodomains revealed in BaTiO 3 prove that its nominal tetragonal structure also allows rotational polar textures.

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The Spectra of Y V and Zr VI

Cited by 19 publications

References 6 publications

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Spectrum and energy levels of five-times ionized zirconium (Zr VI)

Rotational polarization nanotopologies in BaTiO₃/SrTiO₃ superlattices

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The Spectra of Y V and Zr VI

Cited by 19 publications

References 6 publications

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 ⩽ Z ⩽ 42

Spectrum and energy levels of five-times ionized zirconium (Zr VI)

Rotational polarization nanotopologies in BaTiO3/SrTiO3 superlattices

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Rotational polarization nanotopologies in BaTiO₃/SrTiO₃ superlattices