Photoassociation of Cold Ca Atoms

Zinner, G.; Binnewies, T.; Riehle, F.; Tiemann, E.

doi:10.1103/physrevlett.85.2292

Cited by 104 publications

(67 citation statements)

References 20 publications

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“…[1,2,3]). In particular, the long-lived lowest-energy 3 P 2 state can serve as an effective ground state in such experiments.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Cooling and Trapping Metastable Alkaline-Earth Atoms

Derevianko

2001

Phys. Rev. Lett.

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Metastability and long-range interactions of Mg, Ca, and Sr in the lowest-energy metastable 3 P 2 state are investigated. The calculated lifetimes are 38 minutes for Mg * , 118 minutes for Ca * , and 17 minutes for Sr * , supporting feasibility of cooling and trapping experiments. The quadrupole-quadrupole long-range interactions of two metastable atoms are evaluated for various molecular symmetries. Hund's case (c) 4 g potential possesses a large 100-1000 K potential barrier. Therefore magnetic trap losses can possibly be reduced using cold metastable atoms in a stretched M = 2 state. Calculations were performed in the framework of ab initio relativistic configuration interaction method coupled with the random-phase approximation.

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“…[1,2,3]). In particular, the long-lived lowest-energy 3 P 2 state can serve as an effective ground state in such experiments.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Cooling and Trapping Metastable Alkaline-Earth Atoms

Derevianko

2001

Phys. Rev. Lett.

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“…The data for the λ4227.92 line are taken from the highaccuracy photoassociative measurements of Zinner et al (2000), which produces reduced uncertainties compared to previous measurements. Their data have confirmed previous level-crossing measurements of Kluge & Sauter (1974).…”

Section: Calcium Speciesmentioning

confidence: 99%

Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter

Cashman

Kulkarni

Kisielius

et al. 2017

ApJS

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Measurements of element abundances in galaxies from astrophysical spectroscopy depend sensitively on the atomic data used. With the goal of making the latest atomic data accessible to the community, we present a compilation of selected atomic data for resonant absorption lines at wavelengths longward of 911.753Å (the H I Lyman limit), for key heavy elements (heavier than atomic number 5) of astrophysical interest. In particular, we focus on the transitions of those ions that have been observed in the Milky Way interstellar medium (ISM), the circumgalactic medium (CGM) of the Milky Way and/or other galaxies, and the intergalactic medium (IGM). We provide wavelengths, oscillator strengths, associated accuracy grades, and references to the oscillator strength determinations. We also attempt to compare and assess the recent oscillator strength determinations. For about 22% of the lines that have updated oscillator strength values, the differences between the former values and the updated ones are 0.1 dex. Our compilation will be a useful resource for absorption line studies of the ISM, as well as studies of the CGM and IGM traced by sight lines to quasars and gamma-ray bursts. Studies (including those enabled by future generations of extremely large telescopes) of absorption by galaxies against the light of background galaxies will also benefit from our compilation.

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“…This simplifies the interpretation of experimental data and facilitates comparison to theory [16]. The analysis of the photoassociative spectrum of cold 40 Ca atoms measured by Zinner et al may serve as an illustration [17].…”

Section: Introductionmentioning

confidence: 99%

Tensorial analysis of the long-range interaction between metastable alkaline-earth-metal atoms

Santra

Greene

2003

Phys. Rev. A

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Alkaline-earth atoms in their lowest (nsnp) 3 P 2 state are exceptionally long-lived and can be trapped magnetically. The nonspherical atomic structure leads to anisotropic long-range interactions between two metastable alkaline-earth atoms. The anisotropy affects the rotational motion of the diatomic system and couples states of different rotational quantum numbers. This paper develops a tensorial decomposition of the most important long-range interaction operators, and a systematic inclusion of molecular rotations, in the presence of an external magnetic field. This analysis illuminates the nature of the coupling between the various degrees-of-freedom. The consequences are illustrated by application to a system of practical interest: metastable 88 Sr. Using atomic parameters determined in a nearly-ab initio calculation, we compute adiabatic potential energy curves. The anisotropic interatomic interaction, in combination with the applied magnetic field, is demonstrated to induce the formation of a long-range molecular potential well. This curve correlates to two fully polarized, low-field seeking atoms in a rotational s-wave state. The coupling among molecular rotational states controls the existence of the potential well, and its properties vary as a function of magnetic-field strength, thus allowing the scattering length in this state to be tuned. The scattering length of metastable 88 Sr displays a resonance at a field of 339 Gauss.

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Photoassociation of Cold Ca Atoms

Cited by 104 publications

References 20 publications

Feasibility of Cooling and Trapping Metastable Alkaline-Earth Atoms

Feasibility of Cooling and Trapping Metastable Alkaline-Earth Atoms

Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter

Tensorial analysis of the long-range interaction between metastable alkaline-earth-metal atoms

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