Interrogating the Temporal Coherence of EUV Frequency Combs with Highly Charged Ions

Lyu, Chunhai; Cavaletto, Stefano M.; Keitel, Christoph H.; Harman, Z.

doi:10.1103/physrevlett.125.093201

Cited by 15 publications

(7 citation statements)

References 63 publications

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“…45), and the intracavity HHG was spread into the extreme ultraviolet light range 46 , with an expected spectral width of each harmonic of the order of 0.1 Hz (refs. 47,48), which would perfectly match the spectral width of the 45 Sc resonance.…”

Section: Discussionmentioning

confidence: 81%

Resonant X-ray excitation of the nuclear clock isomer 45Sc

Shvyd’ko,

Röhlsberger,

Kocharovskaya

et al. 2023

Nature

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Resonant oscillators with stable frequencies and large quality factors help us to keep track of time with high precision. Examples range from quartz crystal oscillators in wristwatches to atomic oscillators in atomic clocks, which are, at present, our most precise time measurement devices1. The search for more stable and convenient reference oscillators is continuing2–6. Nuclear oscillators are better than atomic oscillators because of their naturally higher quality factors and higher resilience against external perturbations7–9. One of the most promising cases is an ultra-narrow nuclear resonance transition in 45Sc between the ground state and the 12.4-keV isomeric state with a long lifetime of 0.47 s (ref. 10). The scientific potential of 45Sc was realized long ago, but applications require 45Sc resonant excitation, which in turn requires accelerator-driven, high-brightness X-ray sources11 that have become available only recently. Here we report on resonant X-ray excitation of the 45Sc isomeric state by irradiation of Sc-metal foil with 12.4-keV photon pulses from a state-of-the-art X-ray free-electron laser and subsequent detection of nuclear decay products. Simultaneously, the transition energy was determined as $${\mathrm{12,389.59}}_{+0.12\left({\rm{syst}}\right)}^{\pm 0.15\left({\rm{stat}}\right)}\,{\rm{eV}}$$ 12,389.59 + 0.12 syst ± 0.15 stat eV with an uncertainty that is two orders of magnitude smaller than the previously known values. These advancements enable the application of this isomer in extreme metrology, nuclear clock technology, ultra-high-precision spectroscopy and similar applications.

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Section: Discussionmentioning

confidence: 81%

Resonant X-ray excitation of the nuclear clock isomer 45Sc

Shvyd’ko,

Röhlsberger,

Kocharovskaya

et al. 2023

Nature

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“…It has a frequency of 4.96 × 10 16 Hz, a linewidth of only 5 × 10 −8 Hz, and the highest quality factor hitherto found in an excited atomic system. Such HCI species will be used in combination with extreme-ultraviolet frequency combs [382][383][384][385] for laser stabilization and frequency metrology using schemes that have been theoretically analysed for their feasibility [386], and could offer much higher sensitivities to hypothetical particles and fields.…”

Section: Development Of Hci Clocks and Perspectives Towards Higher Fr...mentioning

confidence: 99%

New Horizons: Scalar and Vector Ultralight Dark Matter

Antypas¹,

Banerjee²,

Bartram³

et al. 2022

Preprint

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The last decade has seen unprecedented effort in dark matter model building at all mass scales coupled with the design of numerous new detection strategies. Transformative advances in quantum technologies have led to a plethora of new high-precision quantum sensors and dark matter detection strategies for ultralight (< 10 eV) bosonic dark matter that can be described by an oscillating classical, largely coherent field. This white paper focuses on searches for wavelike scalar and vector dark matter candidates.

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“…Investigation of the 229 Th transition using laser spectroscopy methods has long been discussed in the literature, however new sources of coherent radiation cover the range up to 100 eV (see e.g. [48]), so 76 eV transition in 235 U may be investigated using high precision spectroscopy too. The probability of the photon emission in the bare 235 U nucleus is very small but it is significantly enhanced by the electronic bridge mechanism in many-electron ions [49] (see also [50]).…”

Section: Calculation Of the Sensitivity To α And Mq Variation In Nucl...mentioning

confidence: 99%

Effects of variation of the fine structure constant $α$ and quark mass $m_q$ in Mössbauer nuclear transitions

Fadeev,

Berengut,

Flambaum

2021

Preprint

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High accuracy measurements in Mössbauer transitions open up the possibility to use them in the search for temporal and spatial variation of the fine-structure constant α, quark mass mq, and dark matter field which may lead to the variation of α and mq. We calculate the sensitivity of nuclear transitions to variation of α and mq. Mössbauer transitions have high sensitivity to variation of quark mass mq and the strong interaction scale ΛQCD, to which atomic optical clocks are not sensitive. The enhancement factors K, defined by δf f = Kα δα α and δf f = Kq δmq mq where f is the transition energy, may be large in some transitions. The 8 eV nuclear clock transition in 229 Th (Kq ≈ 10 4 ) and 76 eV transition in 235 U (Kα ≈ Kq ≈ 10 3 ) may be investigated using laser spectroscopy methods.

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Interrogating the Temporal Coherence of EUV Frequency Combs with Highly Charged Ions

Cited by 15 publications

References 63 publications

Resonant X-ray excitation of the nuclear clock isomer 45Sc

Resonant X-ray excitation of the nuclear clock isomer 45Sc

New Horizons: Scalar and Vector Ultralight Dark Matter

Effects of variation of the fine structure constant $α$ and quark mass $m_q$ in Mössbauer nuclear transitions

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