Relativistic many-body calculations of van der Waals coefficients for Yb-Li and Yb-Rb dimers

Porsev, S. G.; Safronova, M. S.; Derevianko, Andrei; Clark, Charles W.

doi:10.1103/physreva.89.022703

Cited by 15 publications

(6 citation statements)

References 58 publications

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“…The primary systematic uncertainty stems from that of C 6 for LiH 2 collisions which has been calculated within 10% preci sion [35] and, as a result, causes 4% systematic error in coef ficient / / / M C 3 10 6 2 5 and the pressure. This systematic may be significantly reduced relying on recent progress in calculations of atomic and molecular interactions [47][48][49]. The statistical standard deviation of τ is 1.6% for the reported measurement.…”

Section: N Tmentioning

confidence: 99%

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

2016

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A calibrationfree primary vacuometer based on an ultracold atomic gas in a shallow far offresonance optical dipole trap is proposed and demonstrated. The pressure is obtained by measuring the loss of trapped atoms which is caused by collisions with the ambient gas of the vacuum chamber. The loss is related to the ambientgas pressure via a theoretical model based on first principles. The model is applicable owing to elimination of a number of systematic effects which otherwise preclude or complicate construction of a firstprinciple model. These systematics include loss unrelated to collisions with the ambient gas as well as loss dependance on the number and energy of trapped atoms. In the demonstrated vacuometer, the atomnumber decay is exponential with the rate proportional to the pressure, where the proportionality coefficient is expressed via the gas composition and van der Waals coefficients C 6 . Whenever the gas composition is unknown, the systematic error is typically well below that of the hotcathode ionization gauge. The vacuometer is implemented using a gas of ultracold lithium6, which is the optimal working body for such a vacuometer. The lowest measured pressure, × − 2.8 10 9 Pa, is limited by the vacuum in the apparatus, while the dominant error source of 4% is due to uncertainty in the C 6 value and may be improved. Comparison with reading of a hotcathode ionization gauge is also shown. Keywords: pressure measurements, vacuometer, laser cooling and trapping of atoms, atomic and molecular interactions, van der Waals forces

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Section: N Tmentioning

confidence: 99%

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

2016

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“…Here E h is the Hartree energy and a 0 is the Bohr radius. The next term is described by the C 8 coefficient which was estimated by Porsev et al to be 1.27(3) × 10 5 E h a 8 0 [38]. We use C 10 = (49/40)×C 2 8 /C 6 recommended by Thakkar and Smith [39] to reduce the number of fitting parameters.…”

Section: Theoretical Analysis: Ground Potential and State Assignmentsmentioning

confidence: 99%

Two-photon photoassociation spectroscopy of the Σ+2 YbLi molecular ground state

et al. 2019

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We report on measurements of the binding energies of several weakly bound vibrational states of the paramagnetic 174 Yb 6 Li molecule in the electronic ground state using two-photon spectroscopy in an ultracold atomic mixture confined in an optical dipole trap. We theoretically analyze the experimental spectrum to obtain an accurate description of the long-range potential of the ground state molecule. Based on the measured binding energies, we arrive at an improved value of the interspecies s-wave scattering length as0 = 30 a0. Employing coherent two-photon spectroscopy we also observe the creation of "dark" atom-molecule superposition states in the heteronuclear Yb-Li system. This work is an important step towards the efficient production of ultracold YbLi molecules via association from an ultracold atomic mixture.

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“…Precision values of atomic transition matrix elements are needed for the determination of polarizabilities, light shifts and magic wavelengths for state-insensitive laser cooling, trapping, and atom manipulation [1,2]; longrange interaction C 6 and C 8 coefficients [3]; blackbody radiation shifts [4] and other systematic clock uncertainties [5]. As a result, there is a critical need for benchmark measurements and calculations of electric-dipole and other transition matrix elements for various searches for physics beyond the standard model of elementary particles [6], further improvement of current atomic clocks [4,7,8] and development of novel frequency standards [9], study of degenerate quantum gases [10] and quantum simulation [11], suppression of decoherence in quantum information processing [12,13], etc.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole matrix elements for the 6p2PJ→7s2S1/2
Toh
¹
,
Damitz
²
,
Glotzbach
³

et al. 2019
Phys. Rev. A
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We report a measurement of the ratio of electric dipole transition matrix elements of cesium for the 6p 2 P 1/2 → 7s 2 S 1/2 and 6p 2 P 3/2 → 7s 2 S 1/2 transitions. We determine this ratio of matrix elements through comparisons of two-color, two-photon excitation rates of the 7s 2 S 1/2 state using laser beams with polarizations parallel to one another vs. perpendicular to one another. Our result of R ≡ 7s 2 S 1/2 ||r||6p 2 P 3/2 / 7s 2 S 1/2 ||r||6p 2 P 1/2 = 1.5272 (17) is in excellent agreement with a theoretical prediction of R = 1.5270 (27). Moreover, the accuracy of the experimental ratio is sufficiently high to differentiate between various theoretical approaches. To our knowledge, there are no prior experimental measurements of R. Combined with our recent determination of the lifetime of the 7s 2 S 1/2 state, we determine reduced matrix elements for these two transitions, 7s 2 S 1/2 ||r||6p 2 P 3/2 = −6.489 (5) a0 and 7s 2 S 1/2 ||r||6p 2 P 1/2 = −4.249 (4) a0. These matrix elements are also in excellent agreement with theoretical calculations. These measurements improve knowledge of Cs properties needed for parity violation studies and provide benchmarks for tests of high-precision theory.

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Relativistic many-body calculations of van der Waals coefficients for Yb-Li and Yb-Rb dimers

Cited by 15 publications

References 58 publications

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

Two-photon photoassociation spectroscopy of the Σ+2 YbLi molecular ground state

Electric dipole matrix elements for the 6p2PJ→7s2S1/2
Toh
¹
,
Damitz
²
,
Glotzbach
³

et al. 2019
Phys. Rev. A
Self Cite
23
0
13
0
View full text Add to dashboard Cite

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Relativistic many-body calculations of van der Waals coefficients for Yb-Li and Yb-Rb dimers

Cited by 15 publications

References 58 publications

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

Primary vacuometer based on an ultracold gas in a shallow optical dipole trap

Two-photon photoassociation spectroscopy of the Σ+2 YbLi molecular ground state

Electric dipole matrix elements for the 6p2PJ→7s2S1/2Toh1, Damitz2, Glotzbach3 et al. 2019Phys. Rev. ASelf Cite230130View full textAdd to dashboardCite

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Electric dipole matrix elements for the 6p2PJ→7s2S1/2
Toh
¹
,
Damitz
²
,
Glotzbach
³

et al. 2019
Phys. Rev. A
Self Cite
23
0
13
0
View full text Add to dashboard Cite