Photoassociation of85Rb atoms into 0u+states near the 5S+5P atomic limits

Bergeman, T.; Qi, Jianbing; Wang, D.; Huang, Yanyan; Pechkis, Hyewon; Eyler, E. E.; Gould, P. L.; Stwalley, William C.; Cline, R. A.; Miller, Joseph D.; Heinzen, D. J.

doi:10.1088/0953-4075/39/19/s01

Cited by 55 publications

(69 citation statements)

References 48 publications

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“…A similar mechanism, which typically results in significant linewidth broadening, has been observed in several other alkali dimers [28]. It affects the 3(0 + ), 3(0 − ) and 3(1) states, as can be seen from the long-range potential in Fig.…”

Section: Spectrum and Assignmentssupporting

confidence: 72%

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
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We report a high-resolution spectroscopic investigation of the long-range states of the 23 Na 87 Rb molecule near its Na(3 2 S 1/2 )+Rb(5 2 P 3/2 ) asymptote. This study was performed with weakly bound ultracold molecules produced via magneto-association with an inter-species Feshbach resonance. We observed several regular vibrational series, which are assigned to the 5 attractive long-range states correlated with this asymptote. The vibrational levels of two of these states have sharp but complex structures due to hyperfine and Zeeman interactions. For the other states, we observed significant linewidth broadenings due to strong predissociation caused by spin-orbit couplings with states correlated to the lower Na(3 2 S 1/2 )+Rb(5 2 P 1/2 ) asymptote. The long-range C6 van der Waals coefficients extracted from our spectrum are in good agreement with theoretical values.

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Section: Spectrum and Assignmentssupporting

confidence: 72%

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
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confidence: 97%

“…1(c)]. The V A curve crosses theV b potential curve shifted down from V b by ∆E fs /3 = 79 cm −1 by the inclusion of the diagonal part of the spin-orbit effective Hamiltonian, H SO [19].The diagonalization of H SO within the {A,b} subspace, hereafter referred to as diabatic, renders two Hund's case c 0 + u (P 1/2 ) and 0 + u (P 3/2 ) adiabatic curves, correlated with the 5S+5P 1/2 and 5S+5P 3/2 asymptotes, split by ∆E fs . The mixing angle θ(R) defines the transformation from the diabatic to the adiabatic basis at a given internuclear distance R: |0 + u (P 1/2 ) = cos θ(R) |A + sin θ(R) |b ,…”

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confidence: 98%

Dynamical interferences to probe short-pulse photoassociation of Rb atoms and stabilization ofRb2dimers

2007

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We analyze the formation of Rb2 molecules with short photoassociation pulses applied to a cold 85 Rb sample. A pump laser pulse couples a continuum level of the ground electronic state X 1 Σ + g with bound levels in the 0 + u (5S+5P 1/2 ) and 0 + u (5S+5P 3/2 ) vibrational series. The nonadiabatic coupling between the two excited channels induces time-dependent beatings in the populations. We propose to take advantage of these oscillations to design further laser pulses that probe the photoassociation process via photoionization or that optimize the stabilization in deep levels of the ground state.PACS numbers: 32.80. Qk, 33.80.Ps, 34.50.Rk Making ultracold molecules in the lowest vibrational level v = 0 of the ground electronic state and creating stable molecular condensates is presently an important challenge since it opens the road toward ultracold chemistry [1,2]. Schemes based on photoassociation (PA) of ultracold atoms [3] with cw lasers, have been very successful to form molecules in an excited electronic state. The latter have been stabilized into excited vibrational levels of the ground electronic state [4,5], but not yet into v = 0 except for the case of RbCs [6]. The possibility of controlling PA by use of short laser pulses has been discussed in theoretical papers [7,8,9, 10] and very recently attempted by two experimental groups [11,12], both in the rubidium case. Success in such experiments will create a bridge between the two domains of cold matter and coherent control, where femtosecond (fs) pulses are used to control chemical reactions [13]. Unfortunately, up to now, PA experiments with fs laser pulses have achieved destruction of the molecules already existing in the trap rather than creation of additional molecules [11,12].Finding ways to avoid this destructive effect is therefore a crucial step in the development of experiments. A promising route is PA through the resonant coupling mechanism as realized, with cw lasers, in Cs 2 [14] and RbCs [15]. For the case of Rb 2 , it populates the 0 + u (5S+5P 1/2 ) and 0 + u (5S+5P 3/2 ) coupled series. This is a textbook example of global mixing of two molecular vibrational series due to spin-orbit (SO) coupling and manifested by strong perturbations in the Rb 2 0 + u fluorescence and cw photoassociation spectra (cf. Refs. [16,17]). The aim of the present paper is to draw attention to the coherent character of the time evolution in the coupled excited states after the PA pulse, and to the possibility or taking advantage of the subsequent dynamical interferences to optimize stabilization and avoid the destruction of the molecules. We consider a simple model with pulses in the picosecond range which populate a limited number of bound vibrational levels, and we analyze characteristic time-dependent oscillations that should appear in experimental signals.Time-dependent fluorescence signals manifesting the coupling between deeply bound levels of the two series have been previously observed by pump-probe spectroscopy [18]. In this experiment, a molecular...

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“…[27]. Their spectrum show a series of resonances with decreasing half-widths, which can be estimated from their figure as varying from about 0.8 cm −1 down to about 0.02 cm −1 close to P 3/2 .…”

Section: Discussionmentioning

confidence: 89%

“…[26]. Such perturbations have been further studied experimentally in the PA spectra of Rb 2 [27,28], and Cs 2 [29,30], and modeled by various means [28,29,30,31,32,33,34,35,36]. In front of this intense activity, the (A, b) coupled system in Rb 2 appears as a suitable test case for the present study.…”

Section: The (A B) Coupled State System In the Rubidium Dimermentioning

confidence: 99%

Optimization of generalized multichannel quantum defect reference functions for Feshbach resonance characterization

Osseni¹,

Dulieu²,

Raoult³

2009

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

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This work stresses the importance of the choice of the set of reference functions in the Generalized Multichannel Quantum Defect Theory to analyze the location and the width of Feshbach resonance occurring in collisional cross-sections. This is illustrated on the photoassociation of cold rubidium atom pairs, which is also modeled using the Mapped Fourier Grid Hamiltonian method combined with an optical potential. The specificity of the present example lies in a high density of quasi-bound states (closed channel) interacting with a dissociation continuum (open channel). We demonstrate that the optimization of the reference functions leads to quantum defects with a weak energy dependence across the relevant energy threshold. The main result of our paper is that the agreement between the both theoretical approaches is achieved only if optimized reference functions are used.

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Photoassociation of⁸⁵Rb atoms into 0_u⁺states near the 5S+5P atomic limits

Cited by 55 publications

References 48 publications

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
11
0
11
0
View full text Add to dashboard Cite

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
11
0
11
0
View full text Add to dashboard Cite

Dynamical interferences to probe short-pulse photoassociation of Rb atoms and stabilization ofRb2dimers

Optimization of generalized multichannel quantum defect reference functions for Feshbach resonance characterization

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Photoassociation of85Rb atoms into 0u+states near the 5S+5P atomic limits

Cited by 55 publications

References 48 publications

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5 Zhu1, Li2, He3 et al. 2016Phys. Rev. A110110View full textAdd to dashboardCite

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5 Zhu1, Li2, He3 et al. 2016Phys. Rev. A110110View full textAdd to dashboardCite

Dynamical interferences to probe short-pulse photoassociation of Rb atoms and stabilization ofRb2dimers

Optimization of generalized multichannel quantum defect reference functions for Feshbach resonance characterization

Contact Info

Product

Resources

About

Photoassociation of⁸⁵Rb atoms into 0_u⁺states near the 5S+5P atomic limits

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
11
0
11
0
View full text Add to dashboard Cite

Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5
Zhu¹,
Li²,
He³
et al. 2016
Phys. Rev. A
11
0
11
0
View full text Add to dashboard Cite