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Journal of Physics Conference Series

Enhancement of cold ground state Rb2molecule formation by a wave shape resonance

Carlos Renato Menegatti, Bruno Marangoni, Luís Gustavo Marcassa

Published Nov 1, 2009• 0 citations
Publisher

Abstract

In this paper, we measured the temperature dependence of the Rb 2 molecule formation rate constant in a MOT. We observed that the production of cold Rb 2 via photoassociation in a magneto-optical trap can be enhanced by varying the temperature of the atomic sample using a molasses phase. Our results indicate that molecule production can be enhanced due to a wave shape resonance by a factor of six, and that the formed molecules are colder than the initial atoms.

DOI
10.1088/1742-6596/194/12/122007

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In this paper, we measured the temperature dependence of the Rb 2 molecule formation rate constant in a MOT. We observed that the production of cold Rb 2 via photoassociation in a magneto-optical trap can be enhanced by varying the temperature of the atomic sample using a molasses phase. Our results indicate that molecule production can be enhanced due to a wave shape resonance by a factor of six, and that the formed molecules are colder than the initial atoms.
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In this paper, we report observation of an enhancement of the ground state molecule Rb 2 formation in a Rb magneto-optical trap due to a photoassociation laser. Such an enhancement effect is due to flux enhancement of atomic pairs at short internuclear distances. Our experimental observations consist in the measurement of the molecular formation rate constant due to a probe laser as a function of the trap laser intensity. The results are compared with a simple semi-classical model, showing good agreement. We conclude that the production of cold Rb 2 may be enhanced using appropriate laser parameters; this may be useful for future experiments involving production and trapping of ultracold ground state molecules.
In this paper, we report the measurement of molecular formation rate constant of Rb2{\mathrm{Rb}}_{2}Rb2​ directly in a magneto-optical trap (MOT). The ground state molecules are detected by two-photon ionization, resonantly enhanced through the intermediate ${a}^{3}{\ensuremath{\Sigma}}_{u}^{+}\ensuremath{\rightarrow}{2}^{3}{\ensuremath{\Pi}}_{g}$ molecular band. We have measured the rate constant as a function of atomic density to conclude that the molecules Rb2{\mathrm{Rb}}_{2}Rb2​ are formed in the MOT by a photoassociation process caused by the trapping laser beams. We also measured the rate constant as a function of the trapping laser intensity. The results here presented are of importance to future experiments involving trapping of cold molecules.
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.
We have observed translationally cold electronic ground-state cesium dimers produced directly in a magneto-optical trap and also by photoassociation of cold atoms in this trap. These neutral molecules were detected using photoionization and time-of-flight spectroscopy. Initial experiments indicated a cold molecular formation rate of about $600{\mathrm{s}}^{\mathrm{\ensuremath{-}}1},$ with no photoassociation laser present. The measured translational temperature of the neutral cesium dimers was approximately 100 \ensuremath{\mu}K.