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 tests with the antihydrogen molecular ion

Myers, E. G.

doi:10.1103/physreva.98.010101

Cited by 32 publications

(29 citation statements)

References 87 publications

(126 reference statements)

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“…This could be used, for example, as a source for an anti-atomic fountain for interferometric measurements 47 . Furthermore, the creation of antimatter molecules 48 , 49 may be possible in such an environment. Cooled anti-atoms could be confined with a weaker field from a non-superconducting or even a permanent magnet, simplifying many aspects of antihydrogen experiments.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Laser cooling of antihydrogen atoms

Baker

Bertsche

Capra

et al. 2021

Nature

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The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision1. Slowing the translational motion of atoms and ions by application of such a force2,3, known as laser cooling, was first demonstrated 40 years ago4,5. It revolutionized atomic physics over the following decades6–8, and it is now a workhorse in many fields, including studies on quantum degenerate gases, quantum information, atomic clocks and tests of fundamental physics. However, this technique has not yet been applied to antimatter. Here we demonstrate laser cooling of antihydrogen9, the antimatter atom consisting of an antiproton and a positron. By exciting the 1S–2P transition in antihydrogen with pulsed, narrow-linewidth, Lyman-α laser radiation10,11, we Doppler-cool a sample of magnetically trapped antihydrogen. Although we apply laser cooling in only one dimension, the trap couples the longitudinal and transverse motions of the anti-atoms, leading to cooling in all three dimensions. We observe a reduction in the median transverse energy by more than an order of magnitude—with a substantial fraction of the anti-atoms attaining submicroelectronvolt transverse kinetic energies. We also report the observation of the laser-driven 1S–2S transition in samples of laser-cooled antihydrogen atoms. The observed spectral line is approximately four times narrower than that obtained without laser cooling. The demonstration of laser cooling and its immediate application has far-reaching implications for antimatter studies. A more localized, denser and colder sample of antihydrogen will drastically improve spectroscopic11–13 and gravitational14 studies of antihydrogen in ongoing experiments. Furthermore, the demonstrated ability to manipulate the motion of antimatter atoms by laser light will potentially provide ground-breaking opportunities for future experiments, such as anti-atomic fountains, anti-atom interferometry and the creation of antimatter molecules.

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Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Laser cooling of antihydrogen atoms

Baker

Bertsche

Capra

et al. 2021

Nature

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“…With further developments in the theory, this may lead to sub-10 −11 values for the mass ratios, but also, by using combinations of transitions, to competitive values for R ∞ and the charge radii of the proton and deuteron [67]. Additionally, with a sufficiently developed theory, measurements of the Zeeman-hyperfine structure and cyclotron frequency of H 2 + can be used to obtain the electron-to-proton mass ratio, and the magnetic moment of the proton [68]. All these projects motivate further measurements of M[p] and M[d] by Penning trap techniques.…”

Section: Atomic Masses Of Hydrogen and Helium Isotopesmentioning

confidence: 99%

High-Precision Atomic Mass Measurements for Fundamental Constants

Myers

2019

Atoms

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Atomic mass measurements are essential for obtaining several of the fundamental constants. The most precise atomic mass measurements, at the 10−10 level of precision or better, employ measurements of cyclotron frequencies of single ions in Penning traps. We discuss the relation of atomic masses to fundamental constants in the context of the revised SI. We then review experimental methods, and the current status of measurements of the masses of the electron, proton, neutron, deuteron, tritium, helium-3, helium-4, oxygen-16, silicon-28, rubidium-87, and cesium-133. We conclude with directions for future work.

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“…The species of antimatter, next in complexity toH, are the positive ion of antihydrogenH + and the antihydrogen molecular ionH + 2 . In particular,H + will be used as an intermediate particle in experiments on the behavior ofH in the gravitational field of the Earth (GBAR experiment, see e.g., [13][14][15] and references therein) whereasH + 2 was suggested in [16] as allowing much more precise, compared toH, tests of the fundamental interactions. Concerning the formation of theH + ion there are two main pathways to produce it directly from antihydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

Formation of H¯+ via radiative attachment of e+ to
Jacob
¹
,
Zhang
²
,
Müller
³

et al. 2020
Phys. Rev. Research
6
0
12
0
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We consider the formation of positive ions of antihydrogenH + via radiative attachment of incident positrons e + to antihydrogen atomsH. The formation mechanisms include (i) spontaneous radiative attachment in which the ion is formed due to spontaneous emission of a photon by a positron incident onH; (ii) induced radiative attachment where the formation proceeds in the presence of a laser field via induced photoemission; and (iii) two-center attachment which takes place in the presence of a neighboring atom B and in which an incident positron is attached toH via resonant transfer of energy to B with its subsequent relaxation through spontaneous radiative decay. We show that the mechanisms (ii) and (iii) can strongly dominate over the known mechanism (i). Besides, according to our estimates, in the range of positron energies ( 1 eV) where the radiative channels are most efficient, the mechanism of (nonradiative) three-body attachment, in which one of two positrons incident onH forms the ion whereas the other one carries away the energy excess, is much weaker than the channel (i). We also briefly discuss three-body attachment where, instead of two positrons, a positron and an electron are incident onH.

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CPT tests with the antihydrogen molecular ion

Cited by 32 publications

References 87 publications

Laser cooling of antihydrogen atoms

Laser cooling of antihydrogen atoms

High-Precision Atomic Mass Measurements for Fundamental Constants

Formation of H¯+ via radiative attachment of e+ to
Jacob
¹
,
Zhang
²
,
Müller
³

et al. 2020
Phys. Rev. Research
6
0
12
0
View full text Add to dashboard Cite

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CPT tests with the antihydrogen molecular ion

Cited by 32 publications

References 87 publications

Laser cooling of antihydrogen atoms

Laser cooling of antihydrogen atoms

High-Precision Atomic Mass Measurements for Fundamental Constants

Formation of H¯+ via radiative attachment of e+ to Jacob1, Zhang2, Müller3 et al. 2020Phys. Rev. Research60120View full textAdd to dashboardCite

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Formation of H¯+ via radiative attachment of e+ to
Jacob
¹
,
Zhang
²
,
Müller
³

et al. 2020
Phys. Rev. Research
6
0
12
0
View full text Add to dashboard Cite