Properties of alkali-metal atoms and alkaline-earth-metal ions for an accurate estimate of their long-range interactions

Kaur, Jasmeet; Nandy, D. K.; Arora, Bindiya; Sahoo, B. K.

doi:10.1103/physreva.91.012705

Cited by 33 publications

(28 citation statements)

References 54 publications

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“…[9][10][11]. As discussed in our previous work [18], we estimate α (k) n s (for k = 0, 2) by expressing…”

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confidence: 99%

“…This is evaluated using an all order relativistic coupled-cluster method with the singles and doubles approximation (SD method) as described in [19,20]. Other small contributions from the higher excited states (referred to as "Tail" contribution), core and core-valence correlations are estimated using lower order perturbative methods as described in [18]. To construct the single particle orbitals for the SD method, we have used total 70 B-spline functions with a cavity of radius R = 220 au.…”

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confidence: 99%

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Magic wavelengths in the alkaline-earth-metal ions

et al. 2015

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We present magic wavelengths for the nS -nP 1/2,3/2 and nS -mD 3/2,5/2 transitions, with the respective ground and first excited D states principal quantum numbers n and m, in the Mg + , Ca + , Sr + and Ba + alkaline earth ions for linearly polarized lights by plotting dynamic polarizatbilities of the nS, nP 1/2,3/2 and mD 3/2,5/2 states of the ions. These dynamic polarizabilities are evaluated by employing a relativistic all-order perturbative method and their accuracies are ratified by comparing their static values with the available high precision experimental or other theoretical results. Moreover, some of the magic wavelengths identified by us in Ca + concurs with the recent measurements reported in [Phys. Rev. Lett. 114, 223001 (2015)]. Knowledge of these magic wavelengths are propitious to carry out many proposed high precision measurements trapping the above ions in the electric fields with the corresponding frequencies.PACS numbers: 32.10 Dk,31.15.Dv, 31.15 ap State-insensitive trapping techniques have lead to tremendous advancements in the manipulation and control of atoms in far detuned optical traps. In this approach, the atoms are trapped at the wavelengths (related to frequencies) of an external electric field at which the differential light shift of an atomic transition, that is intended to be probed, due to the Stark effects nullify. These wavelengths are specially referred to as magic wavelengths (λ magic s) [1]. It has been demonstrated earlier ability of trapping neutral atoms inside high-Q cavities at λ magic s in the strong coupling regime, which is important in the quantum computation and communication schemes [2]. This technique is now widely used to carry out many high precision measurements by eliminating large systematics due to stray electric fields. Another notable application of these wavelengths is to perform clock frequency measurements [3], especially for optical frequency standards [4], that are in turn useful to probe temporal and spatial variations of the fundamental constants [5] and improving global positioning systems [6]. Knowing λ magic s of atomic systems are also very useful in the field of quantum state engineering [7], extracting out precise values of the oscillator strengths [8], etc. because of which extensive studies, both experimentally and theoretically, have been carried out in many atoms recently [6,[9][10][11][12]. On the other hand, singly charged alkaline earth ions are advantageous to carry out very high precision measurements using ion trapping and laser cooling techniques. Some of the prominent examples are the optical frequency standards [13, 14], probing variation of fundamental constants [3, 5], parity non-conservation effects [15,16] etc. Advantages of these ions owe to their metastable D states that provide longer probe times during interrogation of measurements. To reduce system- * Email: arorabindiya@gmail.com † Email: bijaya@prl.res.in atics in these measurements, state insensitive measurements can be more pertinent that will require knowledge of ...

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“…[9][10][11]. As discussed in our previous work [18], we estimate α (k) n s (for k = 0, 2) by expressing…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Magic wavelengths in the alkaline-earth-metal ions

et al. 2015

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“…The differences of the present RCICP calculations and other available results [20,22,34,36,37] are not more than 0.6%. The dynamic dipole polarizabilities computed with the usual oscillator strength sum-rules can be written as…”

Section: B Dipole Matrix Elementsmentioning

confidence: 56%

“…The DFCP method is the same as the present RCICP method except that DFCP uses the Bspline basis. The RCICP dipole polarizability is larger than that calculated by the nonrelativistic configuration interaction plus core polarization(CICP) [34], RCCSD of Lim et al [35], and the RMBPT all-order method [39], but smaller than the RCCSD result of Kaur et al [36,37], the earlier MBPT-SD result [38], and the experimental values [40,41]. If the experimental electric dipole matrix elements of the 5s − 5p J transitions [9] are used in the calculation of polarizabilities, the static dipole polarizability of the 5s state is 318.743 a.u., which agrees with the experimental result [41] very well.…”

Section: B Dipole Matrix Elementsmentioning

confidence: 85%

“…So far none of theoretical results are within the latest experimental error bar, but the RMBPT all-order result is the closest to this latest experimental ratio. [33] 317.62 6.4810 2.3783 CICP [34] 315.7 6.480 2.378 RCCSD [35] 316.17 RCCSD [36,37] 318.47/318.3(6) 6.491(18) MBPT-SD [38] 317.39 RMBPT all-order [22,39] 316.4/322(4) 6.525(37) 2.374 (16) RMBPT [20] 6.520(80) 2.37 Expt.E×H [40] 319(6.1) Expt. [41] 318.79(1.42) Expt.…”

Section: B Dipole Matrix Elementsmentioning

confidence: 99%

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Polarizabilities and tune-out wavelengths of the hyperfine ground states ofRb87,85

et al. 2016

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The static and dynamic polarizabilities, and the tune-out wavelengths of the ground state of Rb and the hyperfine ground states of 87,85 Rb have been calculated by using relativistic configuration interaction plus core polarization(RCICP) approach. It is found that the first primary tune-out wavelengths of the 5s 1/2 , F = 1, 2 states of 87 Rb are 790.018187(193) nm and 790.032602(193) nm severally, where the calculated result for the 5s 1/2 , F = 2 state is in good agreement with the latest high-precision measurement 790.032388(32) nm [Phys. Rev. A 92, 052501 (2015)]. Similarly, the first primary tune-out wavelengths of the 5s 1/2 , F = 2, 3 states of 85 Rb are 790.023515(218) nm and 790.029918(218) nm respectively. Furthermore, the tune-out wavelengths for the different magnetic sublevels MF of each hyperfine level F are also determined by considering the contributions of tensor polarizabilities.

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Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms

Tomza

2017

Phys. Chem. Chem. Phys.

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We consider collisional studies of linear polyatomic ions immersed in ultracold atomic gases and investigate the intermolecular interactions and chemical reactions of several molecular anions (OH − , CN − , NCO − , C2H − , C4H − ) with alkali-metal (Li, Na, K, Rb, Cs) and alkaline-earth-metal (Mg, Ca, Sr, Ba) atoms. State-of-the-art ab initio techniques are applied to compute the potential energy surfaces (PESs) for these systems. The coupled cluster method restricted to single, double, and noniterative triple excitations, CCSD(T), is employed and the scalar relativistic effects in heavier metal atoms are modeled within the small-core energy-consistent pseudopotentials. The leading long-range isotropic and anisotropic induction and dispersion interaction coefficients are obtained within the perturbation theory. The PESs are characterized in detail and their universal similarities typical for systems dominated by the induction interaction are discussed. The two-dimensional PESs are provided for selected systems and can be employed in scattering calculations. The possible channels of chemical reactions and their control are analyzed based on the energetics of reactants. The present study of the electronic structure is the first step towards the evaluation of prospects for sympathetic cooling and controlled chemistry of linear polyatomic ions with ultracold atoms.

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Properties of alkali-metal atoms and alkaline-earth-metal ions for an accurate estimate of their long-range interactions

Cited by 33 publications

References 54 publications

Magic wavelengths in the alkaline-earth-metal ions

Magic wavelengths in the alkaline-earth-metal ions

Polarizabilities and tune-out wavelengths of the hyperfine ground states ofRb87,85

Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms

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