AIP conference proceedings

Translationally cold Cs[sub 2] molecules formation in a magneto-optical trap

A. Fioretti, D. Comparat, Cyril Drag, A. Crubellier, Olivier Dulieu, Françoise Masnou-Seeuws, Claude Amiot, P. Pillet

Published Jan 1, 1998• 0 citations

Abstract

We report on the observation of translationally cold Cs2 molecules at temperatures in the 300–70 μK range, produced by the photoassociation of cold Cs atoms in a vapor-cell magneto-optical trap. The detection method is based on pulsed-laser photoionization of Cs2 molecules into Cs2+ ions, selectively detected through a time-of-flight mass spectrometer. This technique, together with the usual trap-loss method, enables us to perform the spectroscopy of the long-range attractive molecular states below the 6s 2S1/2+6p 2P3/2 dissociation limit.

DOI: 10.1063/1.57187

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AIP conference proceedings

Translationally cold Cs[sub 2] molecules formation in a magneto-optical trap

A. Fioretti, D. Comparat, Cyril Drag, A. Crubellier, Olivier Dulieu, Françoise Masnou-Seeuws, Claude Amiot, P. Pillet

Published Jan 1, 1998• 0 citations

Publisher

Abstract

DOI: 10.1063/1.57187

Related papers

Formation of Cold Cs2 Molecules through Photoassociation

A. Fioretti, D. Comparat, A. Crubellier +3 more

We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magneto-optical trap, within $10{\mathrm{cm}}^{\ensuremath{-}1}$ below the dissociation limit $6s^{2}S_{1/2}+6p^{2}P_{3/2}$ . Our detection method is based on pulsed-laser photoionization of ${\mathrm{Cs}}_{2}$ molecules, selectively detected through a time-of-flight mass spectrometer. Temporal and spatial analysis of ${\mathrm{Cs}}_{2}^{+}$ ions show for the first time the formation of translationally cold ${\mathrm{Cs}}_{2}$ triplet ground state molecules, at a temperature $T\ensuremath{\sim}300\ensuremath{\mu}\mathrm{K}$.We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magneto-optical trap, within $10{\mathrm{cm}}^{\ensuremath{-}1}$ below the dissociation limit $6s^{2}S_{1/2}+6p^{2}P_{3/2}$. Our detection method is based on pulsed-laser photoionization of ${\mathrm{Cs}}_{2}$ molecules, selectively detected through a time-of-flight mass spectrometer. Temporal and spatial analysis of ${\mathrm{Cs}}_{2}^{+}$ ions show for the first time the formation of translationally cold ${\mathrm{Cs}}_{2}$ triplet ground state molecules, at a temperature $T\ensuremath{\sim}300\ensuremath{\mu}\mathrm{K}$.

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PHOTOASSOCIATIVE SPECTROSCOPY OF $Cs_{2}$ MOLECULEPHOTOASSOCIATIVE SPECTROSCOPY OF $Cs_{2}$ MOLECULE

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We report the spectroscopy of molecular $1_{g}, 0^{+}_{u}, 0^{-}_{g}$ and $1_{u}$ state potentials below the dissociattion limit $6s^{2}S_{1/2}+6p^{2}P_{3/2}$ by using the molecular photoassociation technique of cold Cs atoms, in a vapor-cell magneto-optical trap. The $1_{g}$ and $0^{+}_{g}$ states are detected by trap losses. The $0^{-}_{g}$ and $1_{u}$ states, which lead to the formation of cold molecules [1], are detected by photoionizing them into $Cs_{2}^{+}$ and detecting with a time-of-flight mass spectrometer, while the $l_{g}$ and $0^{+}_{u}$ states are detected by trap losses. We give the spectra of the whole series $0^{-}_{g}$ and $1_{u}$ . The $0^{-}_{g}$ series is analyzed in a RKR approach and the hyperfine structure of the $1_{u}$ series will be discussed. The observed modulation of intensities of the lines is due to Franck Condon factors characterizing the photoassociative transition between the initial state of two free atoms and the finalro-vibrational level. The intensity modulation can give access to the scattering lengths of the ground state. This possibility will be discussed.We report the spectroscopy of molecular $1_{g}, 0^{+}_{u}, 0^{-}_{g}$ and $1_{u}$ state potentials below the dissociattion limit $6s^{2}S_{1/2}+6p^{2}P_{3/2}$ by using the molecular photoassociation technique of cold Cs atoms, in a vapor-cell magneto-optical trap. The $1_{g}$ and $0^{+}_{g}$ states are detected by trap losses. The $0^{-}_{g}$ and $1_{u}$ states, which lead to the formation of cold molecules [1], are detected by photoionizing them into $Cs_{2}^{+}$ and detecting with a time-of-flight mass spectrometer, while the $l_{g}$ and $0^{+}_{u}$ states are detected by trap losses. We give the spectra of the whole series $0^{-}_{g}$ and $1_{u}$. The $0^{-}_{g}$ series is analyzed in a RKR approach and the hyperfine structure of the $1_{u}$ series will be discussed. The observed modulation of intensities of the lines is due to Franck Condon factors characterizing the photoassociative transition between the initial state of two free atoms and the finalro-vibrational level. The intensity modulation can give access to the scattering lengths of the ground state. This possibility will be discussed.

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We report on the spectra of the long-range attractive molecular states of the Cs/sub 2/ dimer below the dissociation limits 6s+6p/sub 1/2/ and 6s+6p/sub 3/2/ which are accessible by molecular photoassociation of cold Cs atoms. For the states O/sub u//sup +/ and O/sub g//sup -/(6s+6p/sub 3/2/), we have performed trap-loss measurements, which are in good agreement with the theoretical calculations, performed in a perturbative approach. For the O/sub g//sup -/ and 1/sub u/(6s+6p/sub 3/2/) states, we observe, after spontaneous decay of the electronically excited molecules, the formation of translationally cold molecules. A rate of formation of cold molecules of the order of /spl sim/10/sup 6/ molecules per second is obtained in the case of the state O/sub g//sup $/.We report on the spectra of the long-range attractive molecular states of the Cs/sub 2/ dimer below the dissociation limits 6s+6p/sub 1/2/ and 6s+6p/sub 3/2/ which are accessible by molecular photoassociation of cold Cs atoms. For the states O/sub u//sup +/ and O/sub g//sup -/(6s+6p/sub 3/2/), we have performed trap-loss measurements, which are in good agreement with the theoretical calculations, performed in a perturbative approach. For the O/sub g//sup -/ and 1/sub u/(6s+6p/sub 3/2/) states, we observe, after spontaneous decay of the electronically excited molecules, the formation of translationally cold molecules. A rate of formation of cold molecules of the order of /spl sim/10/sup 6/ molecules per second is obtained in the case of the state O/sub g//sup $/.

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Summary form only given. In contrast to atoms, laser cooling of molecules is very difficult because of the lack of a closed two-level scheme for recycling the population. The molecular photoassociation of cold atoms opens a promising alternative for the formation of cold molecules. The photoassociative spectra are obtained by the usual trap-loss method as well as by pulsed laser photoionization of Cs/sub 2/ molecules into Cs/sub 2//sup +/ ions. Different schemes to obtain formation of cold molecules through photoassociation will be discussed.Summary form only given. In contrast to atoms, laser cooling of molecules is very difficult because of the lack of a closed two-level scheme for recycling the population. The molecular photoassociation of cold atoms opens a promising alternative for the formation of cold molecules. The photoassociative spectra are obtained by the usual trap-loss method as well as by pulsed laser photoionization of Cs/sub 2/ molecules into Cs/sub 2//sup +/ ions. Different schemes to obtain formation of cold molecules through photoassociation will be discussed.

Quantum Electronics and Laser Science ConferenceJan 20, 20030 citations

We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magneto-optical trap, within $10{\mathrm{cm}}^{\ensuremath{-}1}$ below the dissociation limit

6s^{2}S_{1/2}+6p^{2}P_{3/2}

. Our detection method is based on pulsed-laser photoionization of

{\mathrm{Cs}}_{2}

molecules, selectively detected through a time-of-flight mass spectrometer. Temporal and spatial analysis of

{\mathrm{Cs}}_{2}^{+}

ions show for the first time the formation of translationally cold

{\mathrm{Cs}}_{2}

triplet ground state molecules, at a temperature $T\ensuremath{\sim}300\ensuremath{\mu}\mathrm{K}$.

PHOTOASSOCIATIVE SPECTROSCOPY OF

Cs_{2}

MOLECULE

We report the spectroscopy of molecular

1_{g}, 0^{+}_{u}, 0^{-}_{g}

and

1_{u}

state potentials below the dissociattion limit

6s^{2}S_{1/2}+6p^{2}P_{3/2}

by using the molecular photoassociation technique of cold Cs atoms, in a vapor-cell magneto-optical trap. The

1_{g}

and

0^{+}_{g}

states are detected by trap losses. The

0^{-}_{g}

and

1_{u}

states, which lead to the formation of cold molecules [1], are detected by photoionizing them into

Cs_{2}^{+}

and detecting with a time-of-flight mass spectrometer, while the

l_{g}

and

0^{+}_{u}

states are detected by trap losses. We give the spectra of the whole series

0^{-}_{g}

and

1_{u}

. The

0^{-}_{g}

series is analyzed in a RKR approach and the hyperfine structure of the

1_{u}

series will be discussed. The observed modulation of intensities of the lines is due to Franck Condon factors characterizing the photoassociative transition between the initial state of two free atoms and the finalro-vibrational level. The intensity modulation can give access to the scattering lengths of the ground state. This possibility will be discussed.