Charge exchange and chemical reactions with trapped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi mathvariant="normal">Th</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Churchill, Layne; DePalatis, M. V.; Chapman, Michael

doi:10.1103/physreva.83.012710

Cited by 14 publications

(11 citation statements)

References 32 publications

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“…Current experiments utilize laser cooling of atomic ions [1][2][3][4][5][6][9][10][11] or sympathetic cooling of molecular ions [7] in radio frequency (RF) traps with the simultaneous magnetic [2], optical-dipole [3], or magneto-optical trapping and cooling [1,[4][5][6][7] of neutral atoms. These developments have enabled the study of ion-neutral collisional processes down to collision energies corresponding to a few mK.…”

Section: Introductionmentioning

confidence: 99%

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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Cold chemical reactions between laser-cooled Ca+ ions and Rb atoms were studied in an ion-atom hybrid trap. Reaction rate constants were determined in the range of collision energies E coll /kB = 20 mK-20 K. The lowest energies were achieved in experiments using single localized Ca + ions. Product branching ratios were studied using resonant-excitation mass spectrometry. The dynamics of the reactive processes in this system (non-radiative and radiative charge transfer as well as radiative association leading to the formation of CaRb + molecular ions) have been analyzed using high-level quantum-chemical calculations of the potential energy curves of CaRb + and quantumscattering calculations for the radiative channels. For the present low-energy scattering experiments, it is shown that the energy dependence of the reaction rate constants is governed by long-range interactions in line with the classical Langevin model, but their magnitude is determined by shortrange non-adiabatic and radiative couplings which only weakly depend on the asymptotic energy. The quantum character of the collisions is predicted to manifest itself in the occurrence of narrow shape resonances at well-defined collision energies. The present results highlight both universal and system-specific phenomena in cold ion-neutral reactive collisions.

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Section: Introductionmentioning

confidence: 99%

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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“…Ions in this configuration are observed to survive in the trap for a large fraction of an hour. The lifetime is likely limited by charge exchange collisions and chemical reactions with background molecules, processes enhanced by the large electron affinity of Th 3+ [17]. To determine and manipulate the internal states of ultra-cold 229 Th 3+ , optical transition frequencies between the multitude of hyperfine levels must be known at the level of a few MHz.…”

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confidence: 99%

Wigner Crystals ofTh229for Optical Excitation of the Nuclear Isomer

2011

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We have produced laser-cooled Wigner crystals of 229 Th 3+ in a linear Paul trap. The magnetic dipole (A) and electric quadrupole (B) hyperfine constants for four low-lying electronic levels and the relative isotope shifts with respect to 232 Th 3+ for three low-lying optical transitions are measured. Using the hyperfine B constants in conjunction with prior atomic structure calculations, a new value of the spectroscopic nuclear electric quadrupole moment Q = 3.11( 16) eb is deduced. These results are a step towards optical excitation of the low-lying isomer level in the 229 Th nucleus.

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“…As a predecessor for 229 Th 3+ , 232 Th 3+ ions were laser cooled at the Georgia Institute of Technology for reasons of better availability of the material, lower radioactivity and an easier laser-cooling scheme due to the lack of hyperfine structure caused by a nuclear spin equal to zero [56,69,70,334]. Direct laser cooling of 229 Th 3+ ions was experimentally achieved in 2011 at the same institute [57,58,277,279].…”

Section: Direct Laser Coolingmentioning

confidence: 99%

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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Charge exchange and chemical reactions with trappedTh3+

Cited by 14 publications

References 32 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Wigner Crystals ofTh229for Optical Excitation of the Nuclear Isomer

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

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Charge exchange and chemical reactions with trappedTh3+

Cited by 14 publications

References 32 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Wigner Crystals ofTh229for Optical Excitation of the Nuclear Isomer

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Contact Info

Product

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About

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap