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Laser Physics

Temperature dependence of Rb2 molecule formation rate constant in a magneto-optical trap

Bruno Marangoni, Carlos Renato Menegatti, Luís Gustavo Marcassa

Published Dec 23, 2009• 6 citations
Publisher

Abstract

In this paper, we report the measurement of Rb2 molecule formation rate constant due to a two body process in a magneto-optical trap as a function of the sample temperature. The ground state molecules are detected by two-photon ionization, through the intermediate a 3Σ + → 23Π g molecular band. Our results show that the Rb2 molecules formed in the MOT could be due to a wave shape resonance, which enhances the molecule formation rate. This effect may be used to enhance the molecule production; and therefore it maybe important to future experiments involving production and trapping of cold ground state molecules.

DOI
10.1134/s1054660x10030126

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In this paper, we report the measurement of Rb2 molecule formation rate constant due to a two body process in a magneto-optical trap as a function of the sample temperature. The ground state molecules are detected by two-photon ionization, through the intermediate a 3Σ + → 23Π g molecular band. Our results show that the Rb2 molecules formed in the MOT could be due to a wave shape resonance, which enhances the molecule formation rate. This effect may be used to enhance the molecule production; and therefore it maybe important to future experiments involving production and trapping of cold 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.
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.
We report the first observation of translationally cold ( $\ensuremath{\sim}90\ensuremath{\mu}\mathrm{K}$) Rb2{\mathrm{Rb}}_{2}Rb2​ molecules. They are produced in a magneto-optical trap in their triplet ground state. The detection is performed by selective mass spectroscopy after two-photon ionization into Rb2+{\mathrm{Rb}}_{2}^{+}Rb2+​, resonantly enhanced through the intermediate $a{}^{3}{\ensuremath{\Sigma}}_{u}^{+}\ensuremath{\rightarrow}2{}^{3}{\ensuremath{\Pi}}_{g}$ molecular band. The two rubidium isotopes present very different types of behavior that are interpreted in terms of their respective collisional properties.
We report on the observation of ultracold ground electric-state cesium molecules produced directly in a magneto—optical trap with a good signal-to-noise ratio. These molecules arise from the photoassociation of magneto—optical trap lasers and they are detected by resonantly enhanced multiphoton ionization technology. The production rate of ultracold cesium molecules is up to 4×10 4 s −1 . We measure the characteristic time of the ground electric-state cesium molecules generated in the experiment and investigate the Cs 2 + molecular ion intensity as a function of the trapping laser intensity and the ionization pulse laser energy. We conclude that the production of cold cesium molecules may be enhanced by using appropriate experimental parameters, which is useful for future experiments involving the production and trapping of ultracold ground electric-state molecules.
We report the observation of translationally ultracold heteronuclear ground-state molecules in a two-species magneto-optical trap containing 39K and 85Rb atoms. The KRb molecules are produced via photoassociation and detected by multiphoton ionization. We had characterized their temperature and measured their formation rate constant. We believe that the two-species trap could be used as a reliable source of ultracold molecules to be captured by electrostatic, magnetic, or optical traps. This possibility will certainly motivate further investigation of quantum collective effects as well as high-resolution spectroscopy of the rovibrational level structure of cold heteronuclear molecular systems.