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Pastor, P. Cancio; Giusfredi, G.; Natale, P. De; Hagel, Gaëtan; Mauro, C. de; Inguscio, M.

doi:10.1103/physrevlett.97.139903

Cited by 44 publications

(77 citation statements)

References 9 publications

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“…These investigations enable determination of energy-level structure of the element with a good precision. In particular, Feng et al recently [38] determined the frequency of the 2 3 P 1 −2 3 P 2 transition with an uncertainty of 0.36 kHz (1-σ level) while measurements of the 2 3 S 1 −2 3 P 0,1,2 transitions performed by Pastor et al, measured the frequency with uncertainty of ∼ 2 kHz [39].…”

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Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

et al. 2017

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Agreement between theoretical calculations of atomic structure and spectroscopic measurements is used to constrain possible contribution of exotic spin-dependent interactions between electrons to the energy differences between states in helium-4. In particular, constraints on dipole-dipole interactions associated with the exchange of pseudoscalar bosons (such as axions or axion-like particles, ALPs) with masses 10 −2 eV m 10 4 eV are improved by a factor of ∼ 100. The first atomic-scale constraints on several exotic velocity-dependent dipole-dipole interactions are established as well. The most commonly employed framework for the purpose of comparing different experimental searches for exotic spin-dependent interactions is that introduced in Ref.[1] to describe long-range spin-dependent potentials associated with the axion and extended in Ref.[2] to encompass long-range potentials associated with any generic spin-0 or spin-1 boson. The spin-dependent potentials enumerated in Ref. [2] are characterized by dimensionless coupling constants that specify the strength of the interaction between various particles and a characteristic range λ for the interaction associated with the reduced Compton wavelength of the new boson of mass m 0 , λ = /(m 0 c), where is the reduced Planck constant and c is the speed of light. Depending on the nature of the new interaction, different particles will have different coupling constants. In the present work, we study dipole-dipole interactions between electrons at the atomic scale through investigation of the electronic structure of helium-4.Laboratory searches for exotic spin-dependent interactions mediated by new bosons are sensitive and broadly inclusive probes for global symmetries broken at high energy scales [1,2]. For example, the fundamental proper- * Electronic address: filip.ficek@student.uj.edu.pl ties of axions and the axion-like-particles (ALPs) mentioned above [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] are characterized by a symmetry breaking scale f a and an interaction scale Λ. These scales determine, for example, the mass of the ALPand the interaction of an ALP with a Standard Model fermion X is proportional to m X c 2 /f a where m X is the fermion mass. In particular, this work improves laboratory constraints on exotic spin-spin forces between electrons mediated by bosons in the mass range between 10 −2 eV and 10 4 eV by two orders of magnitude. Our research is complementary to experiments searching for an axion/ALP coupling to photons, such as the Axion Dark Matter eXperiment (ADMX) [26], the CERN Axion Solar Telescope (CAST) [27], and light-shining-throughwall experiments such as the Any Light Particle Search (ALPS) [28], since He spectroscopy probes the electron-ALP interaction as opposed to the photon-ALP interaction and is sensitive to a mass range beyond that probed by experiments such as ADMX, CAST, and ALPS. Although star cooling rates constrain certain broad classes of ALPs [29,30], there are a number of loopholes in the astrophysica...

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“…Spectroscopic measurements of helium have been a popular research topic for several decades [38][39][40][41][42]. These investigations enable determination of energy-level structure of the element with a good precision.…”

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Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

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“…In particular for the low-lying states with low angular momentum, accurate measurements of the ionization energies (IE) in helium have allowed stringent tests of two-electron QED [5,8,[10][11][12][13][14]. A schematic overview of the lowest states of helium together with transition wavelengths mentioned in this paper are shown in Figure 1.…”

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High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
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High-precision spectroscopy of the forbidden 2 3 S 1 → 2 1 P 1 transition in quantum degenerate metastable helium We have measured the forbidden 2 3 S1 → 2 1 P1 transition at 887 nm in a quantum degenerate gas of metastable 4 He atoms confined in an optical dipole trap. The determined transition frequency is 338 133 594.4 (0.5) MHz, from which we obtain an ionization energy of the 2 1 P1 state of 814 709 148.6 (0.5) MHz. This ionization energy is in disagreement by > 3σ with the most accurate quantum electrodynamics (QED) calculations available. Our measurements also provide a new determination of the lifetime of the 2 1 P1 state of 0.551 (0.004)stat ( +0.013 −0.000 )syst ns, which is the most accurate determination to date and in excellent agreement with theory.

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“…The accuracy of the spectroscopic measurement depends on the linewidth and the signal to noise ratio (SNR) of the measured spectrum. Therefore, Doppler-free techniques have been widely used in precision spectroscopy [4][5][6][7][8]. Particularly, zero-background Doppler-free scheme, such as polarization spectroscopy [16,17], intermodulated optogalvanic spectroscopy [18,19], intermodulated fluorescence spectroscopy [20], resonance ionization spectroscopy [21] and crossed laser-atomic beam methods [5-8, 11, 12] are powerful techniques to improve spectral SNR for observing weak transitions.…”

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confidence: 99%

“…Precision spectroscopic measurements on the helium transitions, such as absolute transition frequencies [1][2][3][4][5][6], fine-structure intervals [7][8][9][10][11], and isotope shifts [1,4,[12][13] have played essential roles for testing quantum electrodynamics (QED) in many-body atomic calculations [14][15]. The accuracy of the spectroscopic measurement depends on the linewidth and the signal to noise ratio (SNR) of the measured spectrum.…”

Section: Introductionmentioning

confidence: 99%

Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system

Luo

Feng

et al. 2015

Appl. Phys. B

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Abstract:We have demonstrated Doppler-free intermodulated fluorescence spectroscopy of helium 2 3 P-3 1,3 D transitions in an rf discharged sealed-off cell using a compact laser system at 588 nm. An external cavity diode laser at 1176 nm was constructed to seed a Raman fiber amplifier. Laser power of more than one watt at 588 nm was produced by frequency doubling of the fiber amplifier output using a MgO:PPLN crystal. A doubling efficiency of 23 % was achieved. The power-dependent spectra of the 2

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Erratum: Absolute Frequency Measurements of the2 S13→2 P0,1,2

Cited by 44 publications

References 9 publications

Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
View full text Add to dashboard Cite

Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system

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Erratum: Absolute Frequency Measurements of the2 S13→2 P0,1,2

Cited by 44 publications

References 9 publications

Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

High-Precision Spectroscopy of the Forbidden2 S13→2 Notermans1, Vassen2 2014Phys. Rev. Lett.402360View full textAdd to dashboardCite

Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system

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High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
View full text Add to dashboard Cite