Frequency measurement of the 2 
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 two-photon transition in at

Huang, Yi-Jan; Guan, Yuduo; Huang, Yao-Chin; Suen, Te-Hwei; Peng, Jin-Long; Wang, Li-Bang; Shy, Jow−Tsong

doi:10.1103/physreva.97.032516

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…Tables VI and VII present comparisons of theoretical predictions with experimental results for the finestructure intervals and various transition frequencies for the 4 He atom. The result for the 3 1 D 2 -3 3 D 1 transition is obtained by combining together four measurements [3,[20][21][22],…”

Section: Resultsmentioning

confidence: 99%

Quantum-electrodynamic corrections to the 1s3d states of the helium atom

et al. 2019

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We perform quantum electrodynamic calculations of the ionization energy of the 1s3d states of the 4 He atom, including a complete evaluation of the mα 6 correction. We find a large contribution from the nonradiative part of this correction, which has not been accounted for in previous investigations. The additional contribution shifts theoretical predictions for ionization energies by about 10 σ. Despite this shift, we confirm the previously reported systematic deviations between measured experimental results and theoretical predictions for transitions involving 3D states. The reason for these deviations remains unknown.

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Section: Resultsmentioning

confidence: 99%

Quantum-electrodynamic corrections to the 1s3d states of the helium atom

et al. 2019

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“…Particularly, zero-background Doppler-free scheme, such as polarization spectroscopy [11,12], intermodulated optogalvanic spectroscopy [13,14], intermodulated fluorescence spectroscopy [15], resonance ionization spectroscopy [16] and crossed laser-atomic beam methods [7-10, 17, 18] are powerful techniques to improve spectral SNR for observing weak transitions. One of the method, the two-photon spectroscopy in a power-enhanced cavity, has been successfully achieved for helium 2 1 S 0 − 3 3 D 2 transition [19,20]. Previous investigations of helium energy levels have predominantly been focused on transitions within the triplet manifold, encompassing studies of fine and hyperfine structures, as well as total transition frequencies.…”

Section: Introductionmentioning

confidence: 99%

Two-photon spectroscopy of helium 23S1-83D2,3 transitions at 544 nm with a 1.2 W compact laser system

Wu,

Wang

2023

Preprint

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We have demonstrated two-photon spectroscopy in a power-enhanced cavity of helium 23S1-83D2,3 transitions in a radio frequency (RF)-discharged vapor cell with a compact laser system at 544 nm. An external-cavity diode laser at 1088 nm was constructed to seed a Ytterbium-doped fiber amplifier. By employing a MgO:PPLN crystal, we have successfully doubled the laser frequency of the fiber amplifier output, generating laser power exceeding 1.2 W at 544 nm. The normalized doubling efficiency was measured to be $0.78 \%/cm\cdot{}W$.The optical power within the power-enhanced cavity was 11.8 W.Notably, the 23S1-83D2,3 transitions were observed for the first time. Subsequently, we have investigated the pressure shift and AC stark effect of the spectra.These results pave the way for precision measurement of the transition frequencies and will provide stringent test for QED atomic calculations.

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“…Measurements of the fine-structure splitting in the 2 3 P manifold have yielded a test of QED predictions with a precision at the sub-ppb (10 −9 ) level [4][5][6][7]. The Lamb shift of the 2 1 S 0 and 2 3 S 1 states has been determined, respectively, using the 2 1 S 0 → 3 1 D 2 [8] and 2 3 S 1 → 2 3 D 1 two-photon transitions [9]. However, four standard deviations in the discrepancy between measurements for the helium nuclear charge radius, which are determined by two different methods (the 2 3 S → 2 3 P [10-12] and 2 3 S → 2 1 S [13,14] transition frequencies combined with calculations of the QED and recoil corrections [15][16][17]), pose significant challenges to QED theory.…”

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confidence: 99%

QED and relativistic nuclear recoil corrections to the 413-nm tune-out wavelength for the 2 S13 state of helium

Zhang

et al. 2019

Phys. Rev. A

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Comparison of high-accuracy calculations with precision measurement of the 413-nm tune-out wavelength of the He(2 3 S 1 ) state provides a unique test of quantum electrodynamics (QED). We perform large-scale relativistic-configuration-interaction (RCI) calculations of the tune-out wavelength that include the mass-shift operator and fully account for leading relativistic nuclear recoil terms in the Dirac-Coulomb-Breit (DCB) Hamiltonian. We obtain the QED correction to the tune-out wavelength using perturbation theory, and the effect of finite nuclear size is also evaluated. The resulting tune-out wavelengths for the 2 3 S 1 (M J = 0) and 2 3 S 1 (M J = ±1) states are 413.084 26(4) nm and 413.090 15(4) nm, respectively. When we incorporate the retardation correction of 0.000 560 0236 nm obtained by Drake et al. [Hyperfine Interact 240, 31 (2019)] to compare results with the only current experimental value of 413.0938(9 stat )(20 syst ) nm for the 2 3 S 1 (M J = ±1) state, there is 1.4σ discrepancy between theory and experiment, which stimulates further theoretical and higher precision experimental investigations on the 413-nm tune-out wavelength. In addition, we also determine the QED correction for the static dipole polarizability of the He(2 3 S 1 ) state to be 22.5 ppm, which may enable a new test of QED in the future.

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Frequency measurement of the 2 S01 – 3D21 two-photon transition in at

Cited by 15 publications

References 21 publications

Quantum-electrodynamic corrections to the 1s3d states of the helium atom

Quantum-electrodynamic corrections to the 1s3d states of the helium atom

Two-photon spectroscopy of helium 23S1-83D2,3 transitions at 544 nm with a 1.2 W compact laser system

QED and relativistic nuclear recoil corrections to the 413-nm tune-out wavelength for the 2 S13 state of helium

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