2013
DOI: 10.1103/physreva.88.054501
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Measurement of the 21P131D2transition frequency inet al.

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Cited by 14 publications
(17 citation statements)
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“…High-precision spectroscopy in helium is a well-established field, and transitions ranging from wavelengths of 51 nm to 2058 nm [8][9][10][11][12][13][14][15][16][17][18] have been measured in recent years both from the ground state and from several (metastable) excited states. Only two transitions have been measured in both helium isotopes with sufficient precision for accurate nuclear charge radius difference determinations.…”
Section: Introductionmentioning
confidence: 99%
“…High-precision spectroscopy in helium is a well-established field, and transitions ranging from wavelengths of 51 nm to 2058 nm [8][9][10][11][12][13][14][15][16][17][18] have been measured in recent years both from the ground state and from several (metastable) excited states. Only two transitions have been measured in both helium isotopes with sufficient precision for accurate nuclear charge radius difference determinations.…”
Section: Introductionmentioning
confidence: 99%
“…However, we have found that by changing the relative polarization of the two laser beams, the asymmetry can be reduced. In the future, we will use an optical frequency comb stabilized laser system [31] to study the origin of this asymmetric lineshape. Optical frequency measurements of both 2 3 P-3 3 D and 2 3 P-3 1 D transitions will be performed to determine the 3 1 D-3 3 D separation as well as the singlet-triplet mixing coefficient.…”
Section: Resultsmentioning
confidence: 99%
“…The latter contains nuclear mass contributions ∝ (m/M ) 2 and higher. E (4,0) and E (4,1) are the leading relativistic (Breit) correction in the nonrecoil limit and the corresponding firstorder recoil correction, respectively. E (5,0) and E (5,1) are the leading QED correction in the nonrecoil limit and the corresponding first-order recoil correction, respectively.…”
Section: Calculationmentioning
confidence: 99%
“…Being a monatomic gas, helium is easy to work with and can be studied experimentally to great accuracy due to the presence of narrow spectral lines in the spectrum. A large body of experimental results exists for helium spectra, many of them reaching the relative precision of a few parts in 10 −12 [1][2][3][4][5][6][7][8][9][10].…”
Section: Introductionmentioning
confidence: 99%
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