Lifetime measurements of highly excited levels of sr I using stepwise excitation by two pulsed dye lasers

Gornik, W.

doi:10.1007/bf01407202

Cited by 29 publications

(13 citation statements)

References 19 publications

(18 reference statements)

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“…(colour online) Panel (a): Lifetimes of the 1 S0 states of strontium (blue circles, solid curve and dash-dotted curve) and of the 2 S 1/2 states of rubidium (red crosses and dotted curve) at 300 K [66-68]. The solid curve represents the present MQDT results, the dotted and dash-dotted curves the results of a one-channel calculation in the Coulomb approximation, and the markers the experimental lifetimes for strontium 1 S0 states[53,54,58,59]. Panel (b): Lifetimes of the 1 D2 states of strontium, either at 300 K (blue filled circles and solid curve) or 77 K (blue open circles and dashed curve).…”

mentioning

confidence: 99%

Multichannel quantum defect theory of strontium bound Rydberg states

Vaillant

Jones

Potvliege

2014

J. Phys. B: At. Mol. Opt. Phys.

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Using the reactance matrix approach, we systematically develop new multichannel quantum defect theory models for the singlet and triplet S, P, D and F states of strontium based on improved energy level measurements. The new models reveal additional insights into the character of doubly excited perturber states, and the improved energy level measurements for certain series allow fine structure to be resolved for those series' perturbers. Comparison between the predictions of the new models and those of previous empirical and ab initio studies reveals good agreement with most series, however some discrepancies are highlighted. Using the multichannel quantum defect theory wave functions derived from our models we calculate other observables such as Landé gJ -factors and radiative lifetimes. The analysis reveals the impact of perturbers on the Rydberg state properties of divalent atoms, highlighting the importance of including two-electron effects in the calculations of these properties. The work enables future investigations of properties such as Stark maps and long-range interactions of Rydberg states of strontium.In this article, we systematically develop MQDT models for different Rydberg series in strontium. We begin by reviewing the MQDT formalism and the procedure for extracting energy levels and wave functions from an MQDT model. Following this we develop MQDT models for the 1 S 0 , series of strontium, including an analysis of the channel interactions in these series. These models are generally based on experimental energy level data with smaller uncertainties than those used by previous empirical models. Finally, we provide tests of the resulting MQDT models by calculating Landé g J -factors for the 1,3 D 2 series, as well as radiative lifetimes for the 1 S 0 and 1 D 2 series, showing good agreement with experiment over a large range of energies. The accurate calculation of these excited state lifetimes depends crucially on the contribution of doubly excited perturbing states [60], which quench the lifetimes of even highly excited Rydberg states they are admixed to. The analysis of perturbers paves the way for the inclusion of two-electron effects in other calculations that require the knowledge of dipole matrix elements, such as the calculation of long-range interactions or the determination of Stark maps.Atomic units are used throughout the paper, unless otherwise stated.

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confidence: 99%

Multichannel quantum defect theory of strontium bound Rydberg states

Vaillant

Jones

Potvliege

2014

J. Phys. B: At. Mol. Opt. Phys.

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“…figure 1) and the spatially dependent suppression . Experimental Sr(5sns) lifetimes from [36] (triangles), [37] (dots), and [30] (squares), extrapolated to high principal quantum numbers using (10) (solid red line). The dashed and dotted blue lines shows the separate contributions of spontaneous decay and black body radiation, respectively.…”

Section: Decay and Loss Mechanismsmentioning

confidence: 99%

“…The excitation to Rydberg states opens up several additional decay channels due to the finite radiative lifetime of the Rydberg state, off-resonant coupling to autoionizing states and direct photoionization of the Rydberg electron. The lifetime of Sr(5sns 1 S 0 ) Rydberg states due to spontaneous decay and black body radiation has been measured for low and moderate n in [36,37,30]. In order to estimate lifetimes of higher excited states we have fitted this data to the expected behaviour at large effective principal quantum numbers n ⋆ [38] …”

Section: Decay and Loss Mechanismsmentioning

confidence: 99%

Many-body physics with alkaline-earth Rydberg lattices

Mukherjee

Millen

Nath

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

110

121

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Abstract. We explore the prospects for confining alkaline-earth Rydberg atoms in an optical lattice via optical dressing of the secondary core valence electron. Focussing on the particular case of strontium, we identify experimentally accessible magic wavelengths for simultaneous trapping of ground and Rydberg states. A detailed analysis of relevant loss mechanisms shows that the overall lifetime of such a system is limited only by the spontaneous decay of the Rydberg state, and is not significantly affected by photoionization or autoionization. The van der Waals C 6 coefficients for the Sr(5sns 1 S 0 ) Rydberg series are calculated, and we find that the interactions are attractive. Finally we show that the combination of magic-wavelength lattices and attractive interactions could be exploited to generate many-body Greenberger-HorneZeilinger (GHZ) states.

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“…Since with the aid of dye lasers it is no longer a problem to apply two-step or two-photon excitation, the number of investigations on such states has increased (e.g. [7][8][9]). In the case of BaI there exists no previous experimental or theoretical information about oscillator strengths of transitions from the 6snd 10 2 series for n > 8.…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurements of Rydberg states in the 6snd 1 D 2-series of BaI

et al. 1978

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We have measured the lifetimes of 10 Rydberg states from 6s8d ID 2 to 6s 17d 1D 2 in the BaI spectrum by time-resolved recording of the exponential decay of the resonance fluorescence in an atomic beam. The excitation was performed by use of two pulsed dye lasers simultaneously pumped by one nitrogen laser. The lifetime results differ strongly from Coulomb approximation calculations and show deviations from a (n*)3-dependence.

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Lifetime measurements of highly excited levels of sr I using stepwise excitation by two pulsed dye lasers

Cited by 29 publications

References 19 publications

Multichannel quantum defect theory of strontium bound Rydberg states

Multichannel quantum defect theory of strontium bound Rydberg states

Many-body physics with alkaline-earth Rydberg lattices

Lifetime measurements of Rydberg states in the 6snd 1 D 2-series of BaI

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