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Issue 42, 2011
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Deeply bound cold caesium molecules formed after 0g resonant coupling

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Translationally cold caesium molecules are created by photoassociation below the 6s + 6p1/2 excited state and selectively detected by resonance enhanced two photon ionization (RE2PI). A series of excited vibrational levels belonging to the 0g symmetry is identified. The regular progression of the vibrational spacings and of the rotational constants of the 0g (6s + 6p1/2) 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 0g states dissociating into the 6s + 6p3/2 and 6s + 5d3/2 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 a3Σ+u triplet state and of the X1Σ+g ground state. These results may be relevant when conceiving population transferring schemes in cold molecule systems.

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

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Publication details

The article was received on 09 May 2011, accepted on 04 Jul 2011 and first published on 03 Aug 2011

Article type: Paper
DOI: 10.1039/C1CP21488H
Citation: Phys. Chem. Chem. Phys., 2011,13, 18910-18920
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    Deeply bound cold caesium molecules formed after 0g resonant coupling

    H. Lignier, A. Fioretti, R. Horchani, C. Drag, N. Bouloufa, M. Allegrini, O. Dulieu, L. Pruvost, P. Pillet and D. Comparat, Phys. Chem. Chem. Phys., 2011, 13, 18910
    DOI: 10.1039/C1CP21488H

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