Deeply bound cold caesium molecules formed after 0(g)(-) resonant coupling

Year: 2011

Authors: Lignier H., Fioretti A., Horchani R., Drag C., Bouloufa N., Allegrini M., Dulieu O., Pruvost L., Pillet P., Comparat D.

Autors Affiliation: Laboratoire Aime´ Cotton, CNRS, Univ. Paris Sud, baˆt. 505, Campus d’Orsay, 91405, Orsay Cedex, France; CNISM, Dipartimento di Fisica, Universita` di Pisa, Largo B. Pontecorvo, 56127 Pisa, Italy

Abstract: 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)Sigma(+)(u) triplet state and of the X-1 Sigma(+)(g) ground state. These results may be relevant when conceiving population transferring schemes in cold molecule systems.

Journal/Review:

Volume: 13 (42)      Pages from: 18910  to: 18920

More Information: This work is supported by the \”Institut Francilien de Recherche sur les Atomes Froids\” (IFRAF). This work is also partially supported by the network \”Quantum Dipolar Molecules (QuDipMol)\” of the EUROQUAM framework of the European Science Foundation (ESF). A. F. has been supported by the \”Triangle de la Physique\” under contracts 2007-n.74T and 2009-035T \”GULFSTREAM\”. M. A. thanks the EC-Network EMALI, the \”Universite Franco-Italienne\” (Galileo Project) and the bilateral project between the University of Paris-Sud and the University of Pisa.
DOI: 10.1039/c1cp21488h

Citations: 15
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