Lifetimes of levels in neutral strontium (Sr i)*

Andrä, H. J.; Plöhn, H. J.; Wittmann, W.; Gaupp, A.; Stoner, John O.; Gaillard, M.L.

doi:10.1364/josa.65.001410

Cited by 22 publications

(22 citation statements)

References 5 publications

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“…However, typically the literature gives the total transition rate A T from a given excited state to the fine structure manifold states below. So we need establish the relation [25], b [26], c [27], d [28], e [29], f [30], g [31]. [33].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…After calculating magic wavelengths for Sr and Ca optical clock transitions and comparing them to the experimental values, we calculate the polarizability of terahertz transition with data collection mainly from Ref. [20,[25][26][27][28][29][30][31][32].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…Then, we calculate the crossing points for terahertz clock transitions where the difference of polarizability is zero. [26,28,31], then we use updated theoretical data in Ref. [27,30], and for the rest we mainly use theoretical values in Ref.…”

Section: A Strontiummentioning

confidence: 99%

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Magic wavelengths for terahertz clock transitions

Zhou

Chen

et al. 2010

Phys. Rev. A

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Magic wavelengths for laser trapping of boson isotopes of alkaline-earth Sr, Ca and Mg atoms are investigated while considering terahertz clock transitions between the 3 P 0 , 3 P 1 , 3 P 2 metastable triplet states. Our calculation shows that magic wavelengths of trapping laser do exist. This result is important because those metastable states have already been used to realize accurate clocks in the terahertz frequency domain. Detailed discussions for magic wavelength for terahertz clock transitions are given in this paper.

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Section: Theoretical Descriptionmentioning

confidence: 99%

Section: Theoretical Descriptionmentioning

confidence: 99%

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Magic wavelengths for terahertz clock transitions

Zhou

Chen

et al. 2010

Phys. Rev. A

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“…Their transition rate data was converted to oscillator strengths using experimental energy differences and lie within 2-3 % of the present oscillator strengths. The most precise experiment for Sr is that of Andra et al [31] which gave a lifetime of 7.89± 0.05 ns for the 5p 2 3 P 2 e state. This state can decay to the both the 5s5p and 5s6p levels and the lifetime was converted to an oscillator strength by neglecting the transition to the 5s6p state.…”

Section: Oscillator Strengths Of Low-lying Transitionsmentioning

confidence: 99%

Properties of the triplet metastable states of the alkaline-earth-metal atoms

Mitroy

Bromley

2004

Phys. Rev. A

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The static and dynamic properties of the alkaline-earth-metal atoms in their metastable state are computed in a configuration interaction approach with a semiempirical model potential for the core. Among the properties determined are the scalar and tensor polarizabilities, the quadrupole moment, some of the oscillator strengths, and the dispersion coefficients of the van der Waals interaction. A simple method for including the effect of the core on the dispersion parameters is described.

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“…Only the positive ions are used for detecting nuclear-spin polarization by beam-foil spectroscopy. 6 In what follows we do not describe the beam by the occupation probabilities N m of the nuclear m substates but rather by the components of a polarization tensor t k0 . The first component f 10 , which is the only one used for the demonstration of this NMR method, is proportional to the expectation value of the magnetic moment of the beam and therefore also called vector polarization.…”

mentioning

confidence: 99%

Nuclear Magnetic Resonance Studies of Chemisorption of Alkali-Metal Atoms on a W(110) Surface

1984

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NMR measurements were performed with nuclear-spin-polarized alkali-metal atoms ( 6 Li, 7 Li, 23 Na) adsorbed on a clean and an oxygen-covered W(110) surface. For the desorbed alkali-metal ions the change of polarization due to the radio-frequency field was detected by beam-foil spectroscopy. Energy splittings of the nuclear states were found arising from the interaction of nuclear quadrupole moments with electric field gradients. They reflect the spatial charge distribution in the vicinity of the adsorbed alkali-metal atoms.PACS numbers: 68.10Jy, 76.60.Gv The interaction of atoms and molecules with solid surfaces has been of general interest for many years. Although a variety of experimental methods has been developed, there is nevertheless a lack of methods which directly probe spatial charge distributions of surfaces and adsorbed atoms. The electronic charge distribution is of particular interest. It is, for example, the basic quantity of one of the most important theoretical methods used for the calculation of surface properties and chemisorption processes, namely the density-functional theory. 1 ' 2 Such calculations require a detailed experimental check.In solids, liquids, and chemical systems, NMR studies turned out to be one of the most powerful techniques for obtaining such microscopic information. However, the application of these methods to solid surfaces is limited, 3 primarily for the following reasons. Conventional NMR measurements, which are based on the very small nuclear polarization governed by the Boltzmann distribution for the nuclear m substates, need a considerable number of probe nuclei. These are not available for systems which are most interesting in surface physics studies, i.e., single-crystal surfaces with a low adsorbate coverage. Moreover, it is in general difficult to distinguish between the bulk and the surface signal. 4 We have developed a NMR technique for which these two difficulties do not arise. This will be demonstrated for alkali-metal atoms (Li, Na) adsorbed on a clean and an oxygen-covered W(110) surface. The principle of our method is as follows (Fig. 1). A thermal alkali-metal atom beam is nuclear-spin polarized by use of a sextupole magnet and a subsequent adiabatic radio-frequency transition, 5 which determines the initial nuclear-spin polarization of the atomic beam. The fact that the probe atoms are prepared in a source means that the polarization is large. Because we do not utilize the Boltzmann distribution for the nuclear m substates, we need neither low temperatures nor high magnetic fields at the surface. The thermal nuclear-spin-polarized alkali-metal atom beam impinges on the surface to be investigated which is kept at temperatures of 1000 to 1500 K in ultrahigh vacuum. The sample is mounted between two coils which produce the rf field. The surface coverage with alkali-metal atoms was in all cases less than 10" 3 of a monolayer. The alkali-metal atoms get desorbed from the surface partly as neutral atoms, partly as positive ions. Only the positive ions are us...

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Lifetimes of levels in neutral strontium (Sr i)*

Cited by 22 publications

References 5 publications

Magic wavelengths for terahertz clock transitions

Magic wavelengths for terahertz clock transitions

Properties of the triplet metastable states of the alkaline-earth-metal atoms

Nuclear Magnetic Resonance Studies of Chemisorption of Alkali-Metal Atoms on a W(110) Surface

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