Number-resolved detection of dark ions in Coulomb crystals

Schmid, Fabian; Weitenberg, Johannes; Moreno, Jorge; Hänsch, Theodor W.; Udem, Thomas; Ozawa, A.

doi:10.1103/physreva.106.l041101

Cited by 2 publications

(3 citation statements)

References 50 publications

(42 reference statements)

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“…7a). We have recently demonstrated a method for tracking the number of dark ions embedded in an ion crystal in real time with singleparticle sensitivity [59]. This is achieved by exciting the secular motional resonances of the dark ions by applying an oscillating electric field.…”

Section: Ion Trap Setupmentioning

confidence: 99%

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Toward XUV frequency comb spectroscopy of the 1 S–2 S transition in $$\hbox {He}^+$$

et al. 2023

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The energy levels of hydrogen-like atoms and ions are accurately described by bound-state quantum electrodynamics (QED). $$\hbox {He}^{+}$$ He + ions have a doubly charged nucleus, which enhances the higher-order QED contributions and makes them interesting for precise tests of QED. Systematic effects that currently dominate the uncertainty in hydrogen spectroscopy, such as the second-order Doppler shift and time-of-flight broadening, are largely suppressed by performing spectroscopy on trapped and cooled $$\hbox {He}^{+}$$ He + ions. Measuring a transition in $$\hbox {He}^{+}$$ He + will extend the test of QED beyond the long-studied hydrogen. In this article, we describe our progress toward precision spectroscopy of the 1 S–2 S two-photon transition in $$\hbox {He}^{+}$$ He + . The transition can be excited by radiation at a wavelength of 60.8 nm generated by a high-power infrared frequency comb using high-order harmonic generation (HHG). The $$\hbox {He}^{+}$$ He + ions are trapped in a Paul trap and sympathetically cooled with laser-cooled $$\hbox {Be}^{+}$$ Be + ions. Our recently developed signal detection scheme based on secular-scan spectrometry is capable of detecting $$\hbox {He}^{+}$$ He + excitation with single-event sensitivity. Graphic abstract

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Section: Ion Trap Setupmentioning

confidence: 99%

“…By counting the number of steps, the number of dark ions of each species can be identified unambiguously. In our previous publication [59], we demonstrated the scheme by detecting H + 2 and H + 3 ions embedded in a Be + ion crystal.…”

Section: Ion Trap Setupmentioning

confidence: 99%

Toward XUV frequency comb spectroscopy of the 1 S–2 S transition in $$\hbox {He}^+$$

et al. 2023

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“…17−21 A number of methods have been developed for the characterization of small Coulomb crystals, with recent examples including the nondestructive quantum state determination of a single cotrapped ion 22 and the counting of "dark" ions with unitary efficiency (for Coulomb crystals containing no more than eight nonfluorescing ions). 23 While these approaches offer exceptional precision for the characterization of very small Coulomb crystals, they cannot be straightforwardly applied to the study of larger Coulomb crystals�as typically adopted in reactivity studies.…”

Section: ■ Introductionmentioning

confidence: 99%

Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals

Diprose,

Richardson,

Regan

et al. 2024

J. Phys. Chem. A

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Coulomb crystals have proven to be powerful and versatile tools for the study of ion−molecule reactions under cold and controlled conditions. Reactions in Coulomb crystals are typically monitored through a combination of in situ fluorescence imaging of the laser-cooled ions and destructive time-of-flight mass spectrometry measurements of the ejected ions. However, neither of these techniques is able to provide direct structural information on the positions of nonfluorescing "dark" ions within the crystal. In this work, structural information is obtained using a phosphor screen and a microchannel plate detector in conjunction with a Timepix3 camera. The Timepix3 camera simultaneously records the spatial and temporal distribution of all ions that strike the phosphor screen detector following crystal ejection at a selected reaction time. A direct comparison can be made between the observed Timepix3 ion distributions and the distributions established from SIMION simulations of the ion trajectories through the apparatus and onto the detector. Quantitative agreement is found between the measured Timepix3 signal and the properties of Coulomb crystals assigned using fluorescence imaging�independently confirming that the positions and numbers of nonfluorescing ions within Coulomb crystals can be accurately determined using molecular dynamics simulations. It is anticipated that the combination of high-resolution spatial and temporal data will facilitate new measurements of the ion properties within Coulomb crystals.

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Number-resolved detection of dark ions in Coulomb crystals

Cited by 2 publications

References 50 publications

Toward XUV frequency comb spectroscopy of the 1 S–2 S transition in $$\hbox {He}^+$$

Toward XUV frequency comb spectroscopy of the 1 S–2 S transition in $$\hbox {He}^+$$

Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals

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