Efficient formation of strongly bound ultracold caesium molecules by photoassociation with tunnelling

Vatasescu, Mihaela; Dion, Claude M.; Dulieu, Olivier

doi:10.1088/0953-4075/39/19/s09

Cited by 13 publications

(21 citation statements)

References 34 publications

(70 reference statements)

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“…The crossing between the (1) 3 P g and the (2) 3 S + g curves is responsible for giant resonant lines analyzed in our previous experiments. 14,56 As indicated in Fig. 10a the (1) 3 S + g and (2) 3 S + g curves also undergo an avoided crossing around 8a 0 in the region of their inner wall.…”

Section: Theoretical Modelmentioning

confidence: 71%

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

Lignier

Fioretti

Horchani

et al. 2011

Phys. Chem. Chem. Phys.

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Translationally cold caesium molecules are created by photoassociation below the 6s + 6p(1/2) excited state and selectively detected by resonance enhanced two photon ionization (RE2PI). A series of excited vibrational levels belonging to the 0(-)(g) symmetry is identified. The regular progression of the vibrational spacings and of the rotational constants of the 0(-)(g) (6s + 6p(1/2)) levels is strongly altered in two energy domains. These deviations are interpreted in terms of resonant coupling with deeply bound energy levels of two upper 0(-)(g) states dissociating into the 6s + 6p(3/2) and 6s + 5d(3/2) asymptotes. A theoretical model is proposed to explain the coupling and a quantum defect analysis of the perturbed level position is performed. Moreover, the resonant coupling changes dramatically the spontaneous decay products of the photoexcited molecules, strongly enhancing the decay into deeply bound levels of the a(3)Σ(+)(u) triplet state and of the X(1)Σ(+)(g) ground state. These results may be relevant when conceiving population transferring schemes in cold molecule systems.

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Section: Theoretical Modelmentioning

confidence: 71%

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

Lignier

Fioretti

Horchani

et al. 2011

Phys. Chem. Chem. Phys.

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“…Staanum et al 19 observed the a 3 ⌺ u + vЉ =4-6 and 32-47 levels by ultracold atommolecule collisions. Vatasescu and co-workers 20,21 identified the vЉ = 5 and 6 vibrational levels of the a 3 ⌺ u + state. Li et al 6 observed the bound vibrational levels of the a 3 ⌺ u + state by resolved fluorescence from the 3 3 ⌺ g + state.…”

mentioning

confidence: 99%

Experimental investigation of the Cs2 a Σ3u+ triplet ground state: Multiparameter Morse long range potential analysis and molecular constants

Xie

Sovkov

Lyyra

et al. 2009

The Journal of Chemical Physics

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“…In this section we analyze the production of entanglement (quantified by the linear entropy L(t)) in the case of a more complex molecular dynamics, related to a theoretical control scheme proposed to create Cs 2 vibrationally cold molecules [37][38][39] using the multichannel tunneling observed in the cesium photoassociation spectrum [40].…”

Section: Entanglement Dynamics In a System Of Three Electronic Stamentioning

confidence: 99%

“…Moreover, the 0 − g (6s, 6p 3/2 ) = e state (having a double-well potential) is coupled in the inner well region to the 0 − g (6s, 5d) = f electronic state, through a non-adiabatic coupling generated by the spin-orbit interaction [38]. The first chirped pulse, with central frequency ω L1 /2π ( ω L1 = 11729.66 cm −1 ) at t P 1 = 150 ps, couples a 3 Σ + u (6s, 6s) and 0 − g (6s, 6p 3/2 ) at large interatomic distances (R 1 ≈ 94 a 0 ).…”

Section: Entanglement Dynamics In a System Of Three Electronic Stamentioning

confidence: 99%

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Entanglement between electronic and vibrational degrees of freedom in a laser-driven molecular system

Vatasescu

2013

Phys. Rev. A

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We investigate the entanglement between electronic and vibrational degrees of freedom produced by a vibronic coupling in a molecular system described in the Born-Oppenheimer approximation.Entanglement in a pure state of the Hilbert space H=H el H vib is quantified using the von Neumann entropy of the reduced density matrix and the reduced linear entropy. Expressions for these entanglement measures are derived for the 2 × N v and 3 × N v cases of the bipartite entanglement, where 2 and 3 are the dimensions of the electronic Hilbert space H el , and N v is the dimension of H vib . We study the entanglement dynamics for two electronic states coupled by a laser pulse (a 2 × N v case), taking as an example a coupling between the a 3 Σ + u (6s, 6s) and 1 g (6s, 6p 3/2 ) states of the Cs 2 molecule. The reduced linear entropy expression obtained for the 3 × N v case is used to follow the entanglement evolution in a scheme proposed for the control of the vibronic dynamics in a Cs 2 cold molecule, implying the a 3 Σ + u (6s, 6s), 0 − g (6s, 6p 3/2 ), and 0 − g (6s, 5d) electronic states, which are coupled by a non-adiabatic radial coupling and a sequence of chirped laser pulses.

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Efficient formation of strongly bound ultracold caesium molecules by photoassociation with tunnelling

Abstract: Abstract. We calculate the rates of formation and detection of ultracold Cs 2 molecules obtained from the photoassociation of ultracold atoms through the doublewell 0

Cited by 13 publications

References 34 publications

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

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

Experimental investigation of the Cs2 a Σ3u+ triplet ground state: Multiparameter Morse long range potential analysis and molecular constants

Entanglement between electronic and vibrational degrees of freedom in a laser-driven molecular system

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