Ultra-long-range Rydberg molecules in a divalent atomic system

DeSalvo, B. J.; Aman, J. A.; Dunning, F. B.; Killian, T. C.; Sadeghpour, H. R.; Yoshida, Shuhei; Burgdörfer, Joachim

doi:10.1103/physreva.92.031403

Cited by 86 publications

(123 citation statements)

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“…Some of these molecules (e.g., Na 2 ) have been investigated experimentally, or experimentally and computationally [49,[52][53][54] and the interest in the corresponding Rydberg molecules (molecules in which one of the two atoms is in an excited state) is active. [55][56][57] These molecules have neither covalent nor ionic character. The bond between the two atoms-if any-is extremely weak (as highlighted also by the bond distances).…”

Section: Resultsmentioning

confidence: 99%

Information on Gas‐Phase Diatomic Molecules from Magnetically Induced Current Densities

Alvarez‐Thon

Mammino

2017

J Comput Chem

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Magnetically induced current densities are different for different types of chemical bonds, and may help highlight some of their characteristics and stress their main differences. The present work considers magnetically induced current densities in the bonds of diatomic molecules bonded by covalent bonds as well as the gas phase molecules of 1:1 ionic compounds, comparing the current strength values and visualizing current density maps. The results show clear-cut differences for the different types of bonds (non-polar covalent, polar covalent, and ionic), and can also be related to the extent of the covalent or ionic character of a bond. For ionic compounds, the results also show relevant differences depending on the charges of the ions and on their electron configuration (including significant effects from the presence of d electrons in the outer shell of the ions). The article presents and analyses the results in detail. It is concluded that the magnetically induced current densities contribute to the description and interpretation of chemical bonding in diatomic molecules.

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Section: Resultsmentioning

confidence: 99%

Information on Gas‐Phase Diatomic Molecules from Magnetically Induced Current Densities

Alvarez‐Thon

Mammino

2017

J Comput Chem

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“…When a s < 0, V (r) can support molecular states with one or more ground-state atoms bound to the impurity [38,42,43]. A Rydberg polaron is formed when the Rydberg impurity is dressed by the occupation of a large number of these bound states in addition to finite momentum states.…”

Section: Rydberg Polaron Hamiltonianmentioning

confidence: 99%

“…Figure 2 shows calculated values of a s,eff for the interaction of Sr(5sns 3 S 1 ) Rydberg atoms with background strontium atoms [43]. To obtain this result, Eq.…”

Section: Mean-field Approachmentioning

confidence: 99%

Theory of excitation of Rydberg polarons in an atomic quantum gas

et al. 2018

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We present a quantum many-body description of the excitation spectrum of Rydberg polarons in a Bose gas. The many-body Hamiltonian is solved with a functional determinant approach, and we extend this technique to describe Rydberg polarons of finite mass. Mean-field and classical descriptions of the spectrum are derived as approximations of the many-body theory. The various approaches are applied to experimental observations of polarons created by excitation of Rydberg atoms in a strontium Bose-Einstein condensate.

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“…The realization of ultralong-range Rydberg molecules via elastic electronneutral collisions [2] relies on cold, dense atom samples. Since the first observation [3], Rydberg molecules continue to be realized with increasing experimental control in various potential energy landscapes and atomic species [3][4][5][6][7][8][9][10], where the neutral atom ground state wavefunction is typically bound in the outer one or two potential wells of the electron-atom potential energy curves (PECs). By applying an electric field [11] or by exciting nS states with nearly integer quantum defects, as in Cs [12], more deeply bound trilobite Rydberg molecules [2] are realized.…”

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Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas

Schlagmüller¹,

Liebisch²,

Nguyen³

et al. 2016

Phys. Rev. Lett.

100

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We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segrè in 1934 [1], but a line shape which changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e --Rb(5S) scattering, which significantly modifies the interaction potential. With a peak density of 5.5×10 14 cm -3 , and therefore an inter-particle spacing of 1300 a 0 within a Bose-Einstein condensate, the potential energy curves can be probed at these Rydberg ion -neutral atom separations. We present a simple microscopic model for the spectroscopic line shape by treating the atoms overlapped with the Rydberg orbit as zero-velocity, uncorrelated, point-like particles, with binding energies associated with their ion-neutral separation, and good agreement is found.A Rydberg atom excited in a dense background gas of atoms provides a testbed of Rydberg electron-neutral atom collisions. Spectroscopy has always been a sensitive technique for studying these collisions and in particular spectroscopy performed in a cold, dense atom sample eliminates most other line broadening mechanisms, thereby isolating the effects of elastic and inelastic electron-neutral atom collisions on the line shape. The realization of ultralong-range Rydberg molecules via elastic electronneutral collisions [2] relies on cold, dense atom samples. Since the first observation [3], Rydberg molecules continue to be realized with increasing experimental control in various potential energy landscapes and atomic species [3][4][5][6][7][8][9][10], where the neutral atom ground state wavefunction is typically bound in the outer one or two potential wells of the electron-atom potential energy curves (PECs). By applying an electric field [11] or by exciting nS states with nearly integer quantum defects, as in Cs [12], more deeply bound trilobite Rydberg molecules [2] are realized. With higher densities of cold atom samples, many neutral atoms overlap with the Rydberg orbit and the bound states become unresolvable [13,14]. By utilizing the high densities of a Bose-Einstein condensate (BEC), the neutral atoms within the Rydberg orbit provide a probe of elastic and inelastic electron-neutral collisions for a large range of ion-neutral separations. We show in this paper that Rydberg spectroscopy in a BEC allows us to probe, with high resolution, the scattering resonance directly for the first time in this temperature regime.In a completely different temperature regime (> 400 K) than the work presented here (< 1 µK), Rydberg spectroscopy done during the 1980s in unpolarized thermal vapors investigated the line shift and line broadening of Rydberg atoms excited in a background gas of the same species atoms at similar densities [15,16]. Subsequent theory work [17][18][19][20] modeled the line shapes b...

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Ultra-long-range Rydberg molecules in a divalent atomic system

Cited by 86 publications

References 28 publications

Information on Gas‐Phase Diatomic Molecules from Magnetically Induced Current Densities

Information on Gas‐Phase Diatomic Molecules from Magnetically Induced Current Densities

Theory of excitation of Rydberg polarons in an atomic quantum gas

Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas

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