Measurement of the lifetime of the atomic cesium 5^2D_5/2 state with diode-laser excitation

Hoeling, Barbara M.; Yeh, Jeng-Rong; Takekoshi, T.; Knize, R. J.

doi:10.1364/ol.21.000074

Cited by 25 publications

(25 citation statements)

References 14 publications

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“…Thus, it is possible to check consistency between polarizability and lifetime measurements by deriving 5d − 6p matrix elements from 5d lifetime measurements and substituting these values into the 6p polarizability calculations. For either of the two experimental lifetimes, [10,11] this procedure yields a result that disagrees with directly measured polarizabilities [12,13,14] by several standard deviations.The particular all-order method used here is the linearized coupled-cluster method which sums infinite sets of many-body perturbation theory terms. We refer the reader to Refs.…”

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confidence: 83%

“…The difference of the 6p 1/2 and 6s scalar polarizabilities which uses numbers for 5d − 6p matrix elements derived from [10] 5d lifetime measurements α 0 (6p 1/2 ) − α 0 (6s) = 1006(24) a has much larger uncertainty owing to strong cancellation of the contributions from different transitions, and the difference is 1σ. We note that if we were to use another 5d 5/2 lifetime experiment [11], the discrepancies with polarizability measurements only increase. Thus, neither 5d 5/2 lifetime experiment [10,11] is consistent with either [12], [13], or [14] Stark shift measurements within the quoted uncertainties.…”

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confidence: 87%

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Inconsistencies between lifetime and polarizability measurements in Cs

Safronova

Clark

2004

Phys. Rev. A

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Electric-dipole matrix elements for 6p −nd, n = 5, 6, 7 transitions in cesium are calculated using a relativistic all-order method. The resulting matrix elements are used to evaluate 5d lifetimes and 6p polarizabilities. The data are compared with experimental lifetime and polarizability measurements made by different groups. Domination of the 6p scalar polarizabilities by 5d − 6p dipole matrix elements facilitates an exacting consistency check of 5d lifetime and 6p polarizability data. Values of 5d − 6p matrix elements obtained from experimental 5d lifetime data are found to be inconsistent with those inferred from 6p polarizabilities derived from experimental Stark shift data. Our ab initio calculated 6p polarizabilities agree well with experimental determinations.PACS numbers: 31.15. Ar, 32.70.Cs, 32.10.Dk, 31.15.Dv The understanding of the accuracy of ab initio calculations in cesium is vital for the analysis of the Cs parity nonconservation (PNC) experiment [1]. In 1999, motivated by a number of recent high-precision experiments, Bennett and Wieman [2] reanalyzed the agreement of theoretical calculations and experimental data for a number of Cs atomic properties and reduced the previous theoretical uncertainty in the PNC amplitude by a factor of two. Utilizing measurements of the tensor transition polarizability, β, reported in same work, they demonstrated a 2.5σ discrepancy between the value of the weak charge Q W predicted by the Standard Model and that derived from the Cs PNC experiment. Although several papers (for example, [3,4,5,6,7,8,9]), have addressed this disagreement since 1999, the issue of the accuracy of ab initio calculations in Cs continues to be of interest.In this work, we investigate the radiative properties of Cs 6p − nd transitions. Although these do not bear directly on PNC experiments done to date, they have been the subject of careful experimental investigation, and thus provide benchmarks for precise comparison of theory and experiment. In particular, there exist two independent measurements of the lifetimes of the 5d states [10,11], which do not agree within their stated uncertainties. There also exist several experimental determinations of the 6p − 6s Stark shifts which allow to infer the values of polarizabilities of the 6p states [12,13,14]. Here we show that ab initio theory can check the mutual consistency of 5d lifetime and 6p polarizability data, with an accuracy of about 1%. We find the lifetime and polarizability results to be inconsistent at this level. Our calculations agree with the experimental values of 6p polarizabilities, but deviate from both determinations of the 5d lifetimes. We suggest that further experiments are desirable in order to clarify this issue. In addition, * Electronic address: msafrono@physics.udel.edu; Current address: Department of Physics and Astronomy, University of Delaware, Newark, Delaware, 19716 understanding of the accuracy of the 5d state properties in Cs is germane to the ongoing PNC experiment in isoelectronic Ba + [15], since the ...

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confidence: 83%

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confidence: 87%

Inconsistencies between lifetime and polarizability measurements in Cs

Safronova

Clark

2004

Phys. Rev. A

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“…[13] extracts the transition matrix elements | 7P 1/2 ||r||7S 1/2 | and | 7P 3/2 ||r||7S 1/2 | of Fr, and Ref. [14] extracts the transition matrix element | 5D 5/2 ||r||6P 3/2 | of Cs. The case of a multi-channel decay sometimes requires a combination of various experimental approaches to extract the transition matrix elements [1], including the measurement of static scalar polarizability [15], and nonresonant two-photon, two-color linear depolarization spectrum [16].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…We use the following fitting function to describe the data (14) where τ 5D 5/2 and τ 6P 3/2 are the lifetimes of the 5D 5/2 and 6P 3/2 states, respectively and B is a possible background.…”

Section: B Fitting Processmentioning

confidence: 99%

Lifetime measurements of the5dstates of rubidium

2008

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We present lifetime measurements of the 5D 3/2 and 5D 5/2 states of rubidium using the time correlated single photon counting method. We perform the experiment in a magneto-optical trap of 87 Rb atoms using a two-step excitation with the trap laser at 780 nm as the first step. We record the 761.9 nm fluorescence from the decay of the 5D 3/2 state to the 5P 1/2 state, and measure the lifetime of the 5D 3/2 state τ = 246.3(1.6) ns. We record the 420.2 nm fluorescence from the cascade decay of the 5D 5/2 state to the 5S 1/2 state through the 6P 3/2 state, and extract the lifetime of the 5D 5/2 state τ = 238.5(2.3) ns.

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“…This two step transition method is well established both for vapor cells [14] and MOTs [5,6] in alkalis. Figure 1 shows the energy levels of 85 Rb (I = 5/2) relevant to the lifetime measurement.…”

Section: Experimental Methodsmentioning

confidence: 99%

Lifetime measurement of the6slevel of rubidium

et al. 2005

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We present a lifetime measurements of the 6s level of rubidium. We use a time-correlated singlephoton counting technique on two different samples of rubidium atoms. A vapor cell with variable rubidium density and a sample of atoms confined and cooled in a magneto-optical trap. The 5P 1/2 level serves as the resonant intermediate step for the two step excitation to the 6s level. We detect the decay of the 6s level through the cascade fluorescence of the 5P 3/2 level at 780 nm. The two samples have different systematic effects, but we obtain consistent results that averaged give a lifetime of 45.57 ± 0.17 ns.

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Measurement of the lifetime of the atomic cesium 5^2D_5/2 state with diode-laser excitation

Cited by 25 publications

References 14 publications

Inconsistencies between lifetime and polarizability measurements in Cs

Inconsistencies between lifetime and polarizability measurements in Cs

Lifetime measurements of the5dstates of rubidium

Lifetime measurement of the6slevel of rubidium

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