We calculate the rates of formation and detection of ultracold Cs 2 molecules obtained from the photoassociation of ultracold atoms through the double-well 0 g − (6S 1/2 + 6P 3/2 ) state. We concentrate on two features previously observed experimentally and attributed to tunnelling between the two wells (Vatasescu et al 2000 Phys. Rev. A 61 044701). We show that the molecules obtained are in strongly bound levels ( v ″ = 5, 6) of the metastable a 3 Σ u + (6S 1/2 + 6S 1/2 ) ground electronic state.We calculate the rates of formation and detection of ultracold Cs 2 molecules obtained from the photoassociation of ultracold atoms through the double-well 0 g − (6S 1/2 + 6P 3/2 ) state. We concentrate on two features previously observed experimentally and attributed to tunnelling between the two wells (Vatasescu et al 2000 Phys. Rev. A 61 044701). We show that the molecules obtained are in strongly bound levels ( v ″ = 5, 6) of the metastable a 3 Σ u + (6S 1/2 + 6S 1/2 ) ground electronic state.

arXiv:physics/0604139Journal of Physics B Atomic Molecular and Optical PhysicsSep 25, 200611 citations

Formation of ultracold Cs2 molecules through the double-minimum Cs2 31Σu+ state

Marin Pichler, William C. Stwalley, Robert Beuc +1 more

We present a simple model of ultracold cesium dimer formation in which the photoassociation into rovibrational levels of the double-minimum ${\mathrm{Cs}}_{2}$ $3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ state above its internal barrier enables spontaneous or stimulated emission into the lowest rovibrational levels of the ${\mathrm{Cs}}_{2}$ $1(X){}^{1}{\ensuremath{\Sigma}}_{g}^{+}$ ground electronic state. The transition dipole moment should be sufficiently large for observation of such spectral transitions. The use of the ${\mathrm{Cs}}_{2}$ $3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ double-minimum potential could be extended to molecular Bose-Einstein condensates in which an optical trap can be employed for trapping of both atomic and molecular species.We present a simple model of ultracold cesium dimer formation in which the photoassociation into rovibrational levels of the double-minimum ${\mathrm{Cs}}_{2}$ $3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ state above its internal barrier enables spontaneous or stimulated emission into the lowest rovibrational levels of the ${\mathrm{Cs}}_{2}$ $1(X){}^{1}{\ensuremath{\Sigma}}_{g}^{+}$ ground electronic state. The transition dipole moment should be sufficiently large for observation of such spectral transitions. The use of the ${\mathrm{Cs}}_{2}$ $3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ double-minimum potential could be extended to molecular Bose-Einstein condensates in which an optical trap can be employed for trapping of both atomic and molecular species.

Physical Review AJan 15, 200412 citations

FORMING ULTRACOLD MOLECULES

Robin Côté

Dalgarno Celebratory SymposiumNov 1, 20090 citations

Formation of ultracold RbCs molecules by photoassociation

Nadia Bouloufa-Maafa, M Aymar, Olivier Dulieu +1 more

The formation of ultracold metastable RbCs molecules is observed in a double species magneto-optical trap through photoassociation below the 85 Rb(5S 1/2 ) + 133 Cs(6P 3/2 ) dissociation limit followed by spontaneous emission. The molecules are detected by resonance enhanced two-photon ionization. Using accurate quantum chemistry calculations of the potential energy curves and transition dipole moment, we interpret the observed photoassociation process as occurring at short internuclear distance, in contrast with most previous cold atom photoassociation studies. The vibrational levels excited by photoassociation belong to the 5th 0 + or the 4th 0 − electronic states correlated to the Rb(5P 1/2, 3/2 ) + Cs(6S 1/2 ) dissociation limit. The computed vibrational distribution of the produced molecules shows that they are stabilized in deeply bound vibrational states of the lowest triplet state. We also predict that a noticeable fraction of molecules is produced in the lowest level of the electronic ground state.The formation of ultracold metastable RbCs molecules is observed in a double species magneto-optical trap through photoassociation below the 85 Rb(5S 1/2 ) + 133 Cs(6P 3/2 ) dissociation limit followed by spontaneous emission. The molecules are detected by resonance enhanced two-photon ionization. Using accurate quantum chemistry calculations of the potential energy curves and transition dipole moment, we interpret the observed photoassociation process as occurring at short internuclear distance, in contrast with most previous cold atom photoassociation studies. The vibrational levels excited by photoassociation belong to the 5th 0 + or the 4th 0 − electronic states correlated to the Rb(5P 1/2, 3/2 ) + Cs(6S 1/2 ) dissociation limit. The computed vibrational distribution of the produced molecules shows that they are stabilized in deeply bound vibrational states of the lowest triplet state. We also predict that a noticeable fraction of molecules is produced in the lowest level of the electronic ground state.

arXiv:1111.3503Laser PhysicsSep 3, 201223 citations

Trapping and interactions of an ultracold gas of Cs

_{2}

molecules

We present a simple model of ultracold cesium dimer formation in which the photoassociation into rovibrational levels of the double-minimum

{\mathrm{Cs}}_{2}

$3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ state above its internal barrier enables spontaneous or stimulated emission into the lowest rovibrational levels of the

{\mathrm{Cs}}_{2}

$1(X){}^{1}{\ensuremath{\Sigma}}_{g}^{+}$ ground electronic state. The transition dipole moment should be sufficiently large for observation of such spectral transitions. The use of the

{\mathrm{Cs}}_{2}

$3{}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ double-minimum potential could be extended to molecular Bose-Einstein condensates in which an optical trap can be employed for trapping of both atomic and molecular species.