Study of coupled-cluster correlations on electromagnetic transitions and hyperfine structure constants of W VI

Bhowmik, Anal; Roy, Sourav; Dutta, Narendra Nath; Majumder, Sonjoy

doi:10.1088/1361-6455/aa6ccf

Cited by 15 publications

(14 citation statements)

References 89 publications

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“…They are considered here to compute the matrix elements for E1 transitions. Since the state-dependent effect of CP on E1 matrix elements is the dominant correlation mechanism [19,21], we only present this effect graphically in various levels of ionization for all the transitions in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Electron-correlation study of Y iii-Tc vii ions using a relativistic coupled-cluster theory

Das

Bhowmik

Dutta

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Spectroscopic properties, useful for plasma diagnostics and astrophysics, of a few rubidium-like ions are studied here. We choose one of the simplest, but correlationally challenging series where d− and f − orbitals are present in the core and/or valence shells with 4d 2 D 3/2 as the ground state. We study different correlation characteristics of this series and make precise calculations of electronic structure and rates of electromagnetic transitions. Our calculated lifetimes and transition rates are compared with other available experimental and theoretical values. Radiative rates of vacuum ultra-violet electromagnetic transitions of the long lived Tc 6+ ion, useful in several areas of physics and chemistry, are estimated. To the best of our knowledge, there is no literature for most of these transitions.Electron-correlation study of Y III-Tc VII ions using a relativistic coupled-cluster theory 2

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Section: Resultsmentioning

confidence: 99%

Electron-correlation study of Y iii-Tc vii ions using a relativistic coupled-cluster theory

Das

Bhowmik

Dutta

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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“…Our RCC wavefunctions, based on the corresponding DF wavefunctions, produce highly precise E1 transition amplitudes as discussed in our earlier work [31][32][33][34][35][36]. Table I presents a comparison of the most important reduced dipole matrix elements as calculated by us with the corresponding theoretical results of Safronova [37] and some experimental measurements [38,39].…”

Section: Numerical Results and Interpretationsmentioning

confidence: 96%

Tunable magic wavelengths for trapping with focused Laguerre-Gaussian beams

2018

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We present in this paper a theory of dynamic polarizability for an atomic state due to an external field of non-paraxial Laguerre-Gaussian (LG) beam using the sum-over-states technique. A highly correlated relativistic coupled-cluster theory is used to evaluate the most important and correlation sensitive parts of the sum. The theory is applied on Sr + to determine the magic wavelengths for 5s 1/2 → 4d 3/2,5/2 transitions. Results show the variation of magic wavelengths with the choice of orbital and spin angular momenta of the incident LG beam. Also, the tunability of the magic wavelengths is studied using the focusing angle of the LG beam and observed its efficiency in the near-infrared region. Evaluations of the wide spectrum of magic wavelengths from infrared to ultra-violet have substantial importance to the experimentalists for carrying out high precision measurements in fundamental physics. These magic wavelengths can be used to confine the atom or ion at the dark central node or at the high-intensity ring of the LG beam. * analbhowmik@phy.iitkgp.ernet.in † nnd0004@auburn.edu ‡ sonjoym@phy.iitkgp.ernet.in arXiv:1712.06059v2 [physics.atom-ph]

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“…The calculation of dipolar polarizability is based on the sum-over-state [36,37] formalism in which the accurate calculations of E1 matrix elements of 137 Ba + play an important role as the other factors, energy levels of the ion, are extracted from experimental measurements. As stated earlier, we employ correlation exhaustive relativistic coupled-cluster singles, doubles, and partial triple [RCCSD(T)] formalism [42][43][44][45][46][47] to calculate the most dominating E1 matrix elements. Gaussian type orbital (GTO) basis [44,48] with optimized [49] even-tempered exponents [50] is considered to generate precise wavefunctions at the DF (Dirac-Fock) level.…”

Section: Resultsmentioning

confidence: 99%

Two-photon polarizability of Ba$^+$ ion: Control of spin-mixing process in an ultracold $^{137}$Ba$^+$--$^{87}$Rb mixture

Das¹,

Bhowmik²,

Dutta³

et al. 2021

Preprint

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Ionic clocks exhibit one of the most promising candidates for the frequency standards. Recent investigations show the profound advantages of interrogating two laser lights with different frequencies in developing the frequency standards. Here, we present a scheme of a two-photon excitation process to calculate the dynamic polarizabilities of a few low-lying states of 137 Ba + by employing highly correlated relativistic many-body theory. We demonstrate the Stark shift cancellation for the clock states of 137 Ba + at the two-photon magic wavelengths, which would be an essential input to achieve better accuracy for the ionic clock experiments. We also calculate the magic wavelengths under the single-photon process to serve as the reference and for a comparative study. The calculated single-and two-photon magic wavelengths lie in the optical regime and are thus significant for future state-of-the-art experiments. Further, as an application, we investigate the impact of the two-photon polarizability on the spin-mixing process of an ultra-cold spin-1 mixture 137 Ba + − 87 Rb.We demonstrate the flexibility of the spin-exchange mechanism in the mixture in the presence of a tunable magnetic field and highlight the two-photon process-specific spin-oscillation protocol.

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Study of coupled-cluster correlations on electromagnetic transitions and hyperfine structure constants of W VI

Cited by 15 publications

References 89 publications

Electron-correlation study of Y iii-Tc vii ions using a relativistic coupled-cluster theory

Electron-correlation study of Y iii-Tc vii ions using a relativistic coupled-cluster theory

Tunable magic wavelengths for trapping with focused Laguerre-Gaussian beams

Two-photon polarizability of Ba$^+$ ion: Control of spin-mixing process in an ultracold $^{137}$Ba$^+$--$^{87}$Rb mixture

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