Structure hyperfine de la transition 2S1/2-2P1/2 de Hg II (γ=194,2 nm)

Guern, Y.; Bideau-Méhu, A.; Abjean, R.; Johannin-Gilles, A.

doi:10.1088/0031-8949/14/6/005

Cited by 27 publications

(11 citation statements)

References 15 publications

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“…The Sqy2 (F = 1) state is detected by exciting the Szyq (F = 1)~Pqy2 (F = 0) transition with laser 1. ting has been measured by microwave resonance methods to be 40.507 347 996 9(3) GHz [24]. The Piyz hyperfine splitting has been measured by Fabry-Perot interferometry to be 6.955(90) GHz [25). The natural linewidth of the Piyz state is about 70 MHz [26,27].…”

Section: Amentioning

confidence: 99%

Quantum projection noise: Population fluctuations in two-level systems

et al. 1993

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Measurements of internal energy states of atomic ions confined in traps can be used to illustrate fundamental properties of quantum systems, because long relaxation times and observation times are available. In the experiments described here, a single ion or a few identical ions were prepared in well-defined superpositions of two internal energy eigenstates. The populations of the energy levels were then measured. For an individual ion, the outcome of the measurement is uncertain, unless the amplitude for one of the two eigenstates is zero, and is completely uncertain when the magnitudes of the two amplitudes are equal. In one experiment, a single Hg+ ion, confined in a linear rf trap, was prepared in various superpositions of two hyperfine states. In another experiment, groups of Be+ ions, ranging in size from about 5 to about 400 ions, were confined in a Penning trap and prepared in various superposition states. The measured population fluctuations were greater when the state amplitudes were equal than when one of the amplitudes was nearly zero, in agreement with the predictions of quantum mechanics. These fluctuations, which we call quantum projection noise, are the fundamental source of noise for population measurements with a fixed number of atoms. These fluctuations are of practical importance, since they contribute to the errors of atomic frequency standards.

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Section: Amentioning

confidence: 99%

Quantum projection noise: Population fluctuations in two-level systems

et al. 1993

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“…Additional isotope shifts were given by Shorthill and Fowles [6]. Accurate interferometric measurements for 4 lines of Hg II were reported by Burns and Adams [7], and the detailed structure of the 1942 Ð line was studied using Fabry-Perot interferometry by Guern et al [8] and using laser spectroscopy by Hemmati, Bergquist, and Itano [9].…”

Section: Introductionmentioning

confidence: 93%

“…The levels reported at 92566 cm À1 , 104036 cm À1 , 106612 cm À1 , and 110603 cm À1 were rejected as spurious, and the J values of the levels at 97094 cm À1 , 100859 cm À1 , and 111172 cm À1 were revised. Three undesignated AEL levels at 106086 cm À1 , 106213 cm À1 , and 121960 cm À1 were found 5d 10 7p 2 P 3/2 -5d 10 7d 2 D 3/2 5d 10 7d 2 D 5/2 -5d 10 7f 2 F 7/2 5d 10 7p 2 P 1/2 -5d 10 8s 2 S 1/2 5d 10 8p 2 P 1/2 -5d 10 9d 2 D 3/2 5d 10 7s 2 S 1/2 -5d 10 7p 2 P 1/2 5d 10 8p 2 P 3/2 -5d 10 9d 2 D 5/2 5d 9 6s6p ( 2 D 3/2 , 1 P 1 ) 5/2 -5d 10 5g 2 G 7/2 5d 10 5f 2 F 7/2 -5d 10 5g 2 G 9/2 5d 10 7s 2 S 1/2 -5d 9 6s6p ( 2 D 5/2 , 1 P 1 ) 3/2 5d 10 5f 2 F 5/2 -5d 10 (7) 3.8 (7) 8.6 (7) 5.9 (7) 1.6 (8) 7.2 (8) 2.9 (7) 4.1 (8) a Wavelengths shorter than 2000 Ð are in vacuum. Wavelengths longer than 2000 Ð are in standard air.…”

Section: D 9 6s6p Con¢gurationmentioning

confidence: 99%

Spectrum and Energy Levels of Singly-Ionized Mercury (Hg II)

Sansonetti

Reader

2001

Phys. Scr.

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The spectrum of singly-ionized mercury (Hg II) has been observed from 500 Ð to 9880 Ð with sliding sparks and pulsed-RF discharges on 10.7-m grating spectrographs in vacuum and air. About 500 lines have been classi¢ed as transitions between 114 energy levels. In addition to revising the existing system of 5d 10 nl, 5d 9 6s 2 , and 5d 9 6s6p energy levels, we have located new levels of the 5d 8 6s 2 6p, 5d 9 6s7p, 5d 9 6s5f, 5d 9 6s7s, 5d 9 6s6d, and 5d 9 6p 2 con-¢gurations, which occur in the region of the ionization limit. Many of the observed con¢gurations were theoretically interpreted by means of Hartree-Fock calculations and least-squares ¢ts of the energy parameters to the observed levels. The ¢tted parameters were used to calculate oscillator strengths for most of the classi¢ed lines. The ionization energy was revised to 151284.4 AE 0.3 cm À1 (18.75687 AE 0.00004 eV).

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“…The nuclear magnetic moments are taken from [22] unless noted otherwise. The results for the last [23,24], 137 Ba + [25][26][27], 201 Hg + [28], 210 Fr (µ = 4.38(5)µB ) [29,30], 211 Ra + (µ = 0.878(4)µB ) and 213 Ra + (µ = 0.613(2)µB ) [31][32][33]. Theory values for Cs and Fr are from [20].…”

Section: Introductionmentioning

confidence: 99%

Magnetic dipole and electric quadrupole moments of the229Th nucleus

Safronova

Radnaev

et al. 2013

Phys. Rev. A

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We calculate the A and B hyperfine constants for the low-lying states of 229 Th 3+ using a highprecision relativistic all-order approach. By combining these calculations with measurements of the 6d and 5f hyperfine constants [C. J. Campbell et al., Phys. Rev. Lett. 106, 223001 (2011)], we determine the magnetic dipole µ = 0.360(7) µB and the electric-quadrupole Q = 3.11(6) eb moments of the 229 Th nucleus. Our value for µ is five times more accurate and is 22% smaller than the best previous value µ = 0.46(4) µB [S. Gerstenkorn et al., J. Phys. (Paris) 35, 483 (1974)], while our value for Q is the same, but 2.5 times more accurate than the 2011 result. A systematic study of hyperfine structure in eight other monovalent atoms supports our claim of 2% level uncertainty for µ and Q in 229 Th +3 .

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Structure hyperfine de la transition ²S_1/2-²P_1/2 de Hg II (γ=194,2 nm)

Abstract: The hyperfine structure of the 194.2 nm line of Hg II has been studied by Fabry-Pérot interferometry. The A-factors for the odd isotopes have been determined for the levels 2 S 1/2 and 2 P 1/2 and the shifts for the different isotopes in the natural mercury line have been measured.

Cited by 27 publications

References 15 publications

Quantum projection noise: Population fluctuations in two-level systems

Quantum projection noise: Population fluctuations in two-level systems

Spectrum and Energy Levels of Singly-Ionized Mercury (Hg II)

Magnetic dipole and electric quadrupole moments of the229Th nucleus

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