Interferometric frequency measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Te</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow /><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>130</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>reference transitions at 486 nm

Dh, McIntyre; Wm, Fairbank; Lee, Sang Ah; Tw, Hänsch; Riis, Erling

doi:10.1103/physreva.41.4632

Cited by 26 publications

(13 citation statements)

References 18 publications

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“…On the other side, there are no reliable experimental data for the pressure shift of the 2S HFS frequency [6,7]. The upper limit for the 2S HFS frequency shift can be taken as the frequency shift of the 1S ( [21,22]. But considering the theoretical works [23,24], there is no reason to expect the 2S HFS shift to be orders of magnitude higher than for the ground state.…”

Section: Results and Systematic Effectsmentioning

confidence: 99%

2Shyperfine structure of atomic deuterium

et al. 2004

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We have measured the frequency splitting between the (2S, F = 1/2) and (2S, F = 3/2) hyperfine sublevels in atomic deuterium by an optical differential method based on two-photon Doppler-free spectroscopy on a cold atomic beam. The result f (D) HFS (2S) = 40 924 454(7) Hz is the most precise value for this interval to date. In comparison to the previous radio-frequency measurement we have improved the accuracy by the factor of three. The specific combination of hyperfine frequency intervals for metastable-and ground states in deuterium atom D21 = 8fHFS (1S) derived from our measurement is in a good agreement with D21 calculated from quantum-electrodynamics theory.

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Section: Results and Systematic Effectsmentioning

confidence: 99%

2Shyperfine structure of atomic deuterium

et al. 2004

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“…According to [13], the interaction cross section for atomic hydrogen in the 2S state is different for triplet and singlet states, and the pressure shift of the 2S hyperfine interval is comparable to the pressure shift of the 2S triplet level. The previous 2S hyperfine interval measurement [2] indicates for a pressure shift of −31(24) MHz/mbar, which is of the same order of magnitude as the pressure shift of the 1S(F = 1, m F = ±1) → 2S(F = 1, m F = ±1) transition in hydrogen which is −8(2) MHz/mbar [11,12].…”

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confidence: 92%

High-Precision Optical Measurement of the2SHyperfine Interval in Atomic Hydrogen

et al. 2004

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We have applied an optical method to the measurement of the 2S hyperfine interval in atomic hydrogen. The interval has been measured by means of two-photon spectroscopy of the 1S − 2S transition on a hydrogen atomic beam shielded from external magnetic fields. The measured value of the 2S hyperfine interval is equal to 177 556 860(15) Hz and represents the most precise measurement of this interval to date. The theoretical evaluation of the specific combination of 1S and 2S hyperfine intervals D21 is in moderately good agreement with the value for D21 deduced from our measurement. PACS numbers: 12.20.Fv, 32.10.Fn, 32.30.Jc, 42.62.Fi The frequency of the 2S hyperfine interval f HFS (2S) has been measured twice during the last 50 years by driving the magnetic-dipole radio-frequency transition in a hydrogen thermal beam [1,2]. The relative accuracy of these measurements (150−300 ppb) exceeds the accuracy of the theoretical prediction for the 2S hyperfine interval which is restricted by an insufficient knowledge of the proton structure. However, the specific combination of the 1S and 2S hyperfine intervalscan be calculated with high precision due to significant cancellations of nuclear structure effects (see [3] For the measurement of the 2S hyperfine interval in atomic hydrogen we have applied 1S − 2S two-photon spectroscopy to a cold hydrogen atomic beam which is shielded from magnetic fields. Using a high-finesse cavity as a frequency flywheel we deduce the 2S hyperfine interval as the frequency difference between two extremely stable laser light fields which excite the respective transitions between the different hyperfine sublevels of the 1S and 2S states in atomic hydrogen. The differential measurement cancels some important systematic effects typical for two-photon spectroscopy on atomic beams. Applying this optical method, we achieve a level of accuracy which is nearly 2 times better than the accuracy of the recent radio-frequency measurement [2]. Along with the previous optical Lamb shift measurement [6], our present measurement demonstrates the perspectives of precision optical methods in fields where traditionally radio-frequency techniques have been used.The hydrogen spectrometer setup, described in detail elsewhere [7], has been modified by magnetic compensation and shielding systems and an optional differential pumping system [8]. A dye laser operating near 486 nm is locked to an ultra-stable reference cavity made from ULE by means of the Pound-Drever-Hall lock. The drift of the cavity, suspended in a vacuum chamber with a two-stage active temperature stabilization system, is typically 0.5 Hz/s.The frequency of the dye laser light is doubled in a β-barium borate crystal, and the resulting UV radiation near 243 nm is coupled into a linear enhancement cavity inside a vacuum chamber. Atomic hydrogen, produced in a radio-frequency discharge at a pressure of around 1 mbar, flows through teflon tubes to a copper nozzle cooled to 5 K with a helium flow-through cryostat. Hydrogen atoms thermalize in inelast...

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“…This corresponds to a pressure in the nozzle of 10 À4 mbar. Using the MC simulation and the pressure shift coefficient of À8ð2Þ MHz=mbar [19,20], we expect a pressure shift for each of the isotopes of À3 Hz for delay 1410 s. Averaging the data recorded at regular flow, we obtain f D 1SÀ2S À f H 1SÀ2S ¼ 671 209 560 203:1ð5:1Þ Hz, where 0 ¼ 5:1 Hz is the statistical uncertainty. We also measure the isotope shift at H 2 =D 2 flows increased by a factor of $3 while maintaining the other isotope flow at the regular level [see Fig.…”

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confidence: 94%

Precision Measurement of the Hydrogen-Deuterium1S−2SIsotope Shift

et al. 2010

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Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670,994,334,606(15) Hz. This is a 10-times improvement over the previous best measurement [A. Huber, Phys. Rev. Lett. 80, 468 (1998)] confirming its frequency value. A calculation of the difference of the mean square charge radii of deuterium and hydrogen results in d - p =3.82007(65) fm2, a more than twofold improvement compared to the former value.

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Interferometric frequency measurement ofTe2130reference transitions at 486 nm

Cited by 26 publications

References 18 publications

2Shyperfine structure of atomic deuterium

2Shyperfine structure of atomic deuterium

High-Precision Optical Measurement of the2SHyperfine Interval in Atomic Hydrogen

Precision Measurement of the Hydrogen-Deuterium1S−2SIsotope Shift

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