Deeply bound cold caesium molecules formed after 0−g resonant coupling

Lignier, Hans; Fioretti, A.; Horchani, R.; Drag, Cyril; Bouloufa, Nadia; Allegrini, M.; Dulieu, Olivier; Pruvost, Laurence; Pillet, P.; Comparat, D.

doi:10.1039/c1cp21488h

Cited by 21 publications

(37 citation statements)

References 55 publications

(92 reference statements)

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“…2(a). Although the PA scheme essentially produces molecules in the a state, a fraction of those are stabilized in the X state through a two-photon decay process (equivalent to [7,16]). In order to quantify the number of molecules initially in the X state, we added the vibrational cooling to PA and obtained the spectrum shown in Fig.…”

Section: Simultaneouslymentioning

confidence: 99%

“…We used transitions toward 0 − g (P 3/2 ), v = 6, J = 2 atν = 11665.2055 cm −1 [13] and 0 − g (P 1/2 ), v = 32 atν = 11158.5252 cm −1 [16] that respectively form molecules in 37 v a 50 and in the highest levels of the a state. The latter distribution is not transferred by our conversion scheme, which is consistent with the previously evoked poor FC factors between the a state and (2) 3 Π g .…”

Section: Simultaneouslymentioning

confidence: 99%

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Triplet-singlet conversion by broadband optical pumping

et al. 2012

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We demonstrate the conversion of cold Cs2 molecules initially distributed over several vibrational levels of the lowest triplet state a 3 Σ + u into the singlet ground state X 1 Σ + g . This conversion is realized by a broadband laser exciting the molecules to a well-chosen state from which they may decay to the singlet state through two sequential single-photon emission steps: The first photon populates levels with mixed triplet-singlet character, making possible a second spontaneous emission down to several vibrational levels of the X 1 Σ + g states. By adding an optical scheme for vibrational cooling, a substantial fraction of molecules are transferred to the ground vibrational level of the singlet state. The efficiency of the conversion process, with and without vibrational cooling, is discussed at the end of the article. The presented conversion is general in scope and could be extended to other molecules.PACS numbers: 33.15. Bh, 33.20.Tp, 33.70.Ca, The last decade has witnessed increasing experimental efforts to produce large samples of ultracold molecules in a well-defined quantum state. Such samples constitute a very interesting basis for a great variety of studies ranging from controlled molecular dynamics [1] and anisotropic long-range interactions [2] to precision measurements [3] and quantum computing [4]. Internal-state manipulation of ultracold alkali-metal molecules has been in the spotlight with the stimulated raman adiabatic passage (STIRAP) technique, which allows transfer, with nearunity efficiency, of weakly bound molecules produced by magneto-association in the lowest triplet state to the absolute singlet ground state [5,6]. However, this technique is not suited to samples of molecules distributed in several vibrational levels, such as those produced by the widespread technique of cold-atom photoassociation.Motivated by the goal of finding general methods to achieve this transfer, we propose an optical scheme to move a whole vibrational distribution from a specific electronic state to another one of different multiplicity and parity. By combining this technique with our vibrational cooling technique [7], we are able to produce large samples of ultracold molecules in the lowest vibrational level of the ground state. This successful combination demonstrates the versatility of the optical vibrational cooling. Our demonstration relies on photoassociated ultracold Cs 2 molecules stabilized in a vibrational distribution of the lowest triplet state a 3 Σ

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Section: Simultaneouslymentioning

confidence: 99%

Section: Simultaneouslymentioning

confidence: 99%

Triplet-singlet conversion by broadband optical pumping

et al. 2012

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“…In Ref. [36] we have shown that the vibrational pumping toward v = 0 is very efficient only for low vibrational levels (v X < 10). This result is confirmed by computing, via a numerical simulation, the pumping efficiency from a given v X toward v X = 0 as shown in Figure 10.…”

Section: Rotational Coolingmentioning

confidence: 99%

“…The triplet ground electronic state, however, at the average distance 8.73 a 0 corresponds to the range of the repulsive wall so that only dissociating pairs could be formed. More recently, another mechanism of formation of cesium molecules in the ground singlet electronic state has been found [36]. In this mechanism, shown in Figure1b), the PA laser is set to excite long range vibrational levels belonging to the 0 − g (6s + 6p 1/2 ) state.…”

Section: Photoassociationmentioning

confidence: 99%

“…The main idea of the vibrational pumping demonstrated for Cs 2 molecules in [20,21,36,[41][42][43] and recently for NaCs molecules [24] consists in using a broadband laser tuned to the transitions between the different vibrational levels v X and the levels belonging to an electronically excited state, namely the B 1 Π u state in the cesium case. Starting from a given vibrational distribution of v X , the aim is to transfer it into a single target vibrational level.…”

Section: Selective Ionization Spectroscopymentioning

confidence: 99%

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Laser cooling of rotation and vibration by optical pumping

et al. 2013

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We have recently demonstrated that optical pumping methods combined with photoassociation of ultra-cold atoms can produce ultra-cold and dense samples of molecules in their absolute rovibronic ground state. More generally, both the external and internal degrees of freedom can be cooled by addressing selected rovibrational levels on demand. Here, we recall the basic concepts and main steps of our experiments, including the excitation schemes and detection techniques we use to achieve the rovibrational cooling of Cs 2 molecules. In addition, we present the determination of formation pathways and a theoretical analysis explaining the experimental observations. These simulations improves the spectroscopic knowledge required to transfer molecules to any desired rovibrational level.

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Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

Guttridge

2019

Springer Theses

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This thesis reports the first measurements of the ground state binding energies of CsYb molecules and the scattering lengths of the Cs+Yb system. The knowledge gained from these measurements will be essential for devising the most efficient route for the creation of rovibrational ground state CsYb molecules. CsYb molecules in the rovibrational ground state possess both electric and magnetic dipole moments which opens up a wealth of applications in many areas of physics and chemistry. I would not be where I am today without the support of my whole family. I would especially like to thank my Mam and Dad for for always pushing me forward in my endeavours and never letting me forget the important things in life.Finally, I must thank Steph for her endless love and support.

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Deeply bound cold caesium molecules formed after 0−g resonant coupling

Cited by 21 publications

References 55 publications

Triplet-singlet conversion by broadband optical pumping

Triplet-singlet conversion by broadband optical pumping

Laser cooling of rotation and vibration by optical pumping

Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

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