Optical Suppression of Photoassociative Ionization in a Magneto-Optical Trap

Marcassa, Luís Gustavo; Muniz, Sérgio Ricardo; queiroz, E De; Zílio, Sérgio Carlos; Bagnato, Vanderlei Salvador; Weiner, J.; Julienne, Paul S.; Suominen, Kalle-Antti

doi:10.1103/physrevlett.73.1911

Cited by 58 publications

(50 citation statements)

References 14 publications

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“…We also note that photoassociative spectroscopy may be useful as a probe of the short-range approach of cold atoms. Such a probe may also allow more detailed studies of optical "shielding" of collisions (3,(171)(172)(173)(174), where close approach is suppressed by excitation to a repulsive potential.…”

Section: Fig 30 Blow-up Of the Region Of Overlap Inmentioning

confidence: 98%

Photoassociation of Ultracold Atoms: A New Spectroscopic Technique

Stwalley

Wang

1999

Journal of Molecular Spectroscopy

246

164

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Section: Fig 30 Blow-up Of the Region Of Overlap Inmentioning

confidence: 98%

Photoassociation of Ultracold Atoms: A New Spectroscopic Technique

Stwalley

Wang

1999

Journal of Molecular Spectroscopy

246

164

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“…in the following contexts: suppression of heating and escape of atoms in MOTs [16], shielding of photoassociative ionizing collisions [17], shielding of ionizing collisions of metastable xenon and krypton [18,19], and optical suppression in two-photon "energy pooling" collisions in Rb MOTs [20]. Theoretical methods used for shielding studies include MCWF simulations [21], Landau-Zener [21] and three- If the transfer back to the ground state is not complete, the atom pair may gain kinetic energy as it is further accelerated by the excited state potential.…”

Section: B Shielding Of Ground State Processesmentioning

confidence: 99%

Optical shielding of cold collisions in blue-detuned near-resonant optical lattices

Piilo

Suominen

2002

Phys. Rev. A

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We report Monte Carlo wave function simulation results for two colliding atoms in a blue-detuned near-resonant J = 1 → J = 1 optical lattice. Our results show that complete optical shielding of collisions can be achieved within the lattice with suitably selected and realistic laser field parameters. More importantly, our results demonstrate that the shielding effect does not interfere with the actual trapping and cooling process, and it is produced by the lattice lasers themselves, without the need to use additional laser beams. 32.80.Pj, 34.50.Rk, 42.50.Vk,

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“…[2][3][4][5][6][7][8][9][10] Recently, the rapid development in laser cooling, trapping and Bose-Einstein condensation has again triggered many new investigations of the long-range interactions of the alkali dimers. [9][10][11][12][13][14][15][16] This is because accurate knowledge of the long-range potential curves ͑especially correlated with the ground and the first-excited asymptotes such as 4sϩ4s and 4sϩ4p for K 2 ͒ is crucial in the interpretation of many new physical phenomena associated with ultracold atoms, such as cold collision dynamics, 17,18 photoassociative ionization, [19][20][21] fine-and hyperfine predissociation, [22][23][24] optical suppression of inelastic collisions, [25][26][27] as well as the stability of Bose-Einstein condensates. [28][29][30] Since long-range interactions are always associated with highly excited molecular vibrational levels and very weak binding energies ͑typically a few eV͒, determination of long-range potential energy curves based on conventional molecular spectroscopy is extremely difficult because direct Franck-Condon transitions are not able to access these vibrational levels near dissociation from the thermally populated region of the bound ground state.…”

Section: Introductionmentioning

confidence: 99%

Long-range interaction of the 39K(4s)+39K(4p) asymptote by photoassociative spectroscopy. I. The g− pure long-range state and the long-range potential constants

Wang

Gould

Stwalley

1997

The Journal of Chemical Physics

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Long-range interaction of the 39K(4s)+39K(4p) asymptote by photoassociative spectroscopy. I. The 0g− pure long-range state and the long-range potential constants This paper reports on a comprehensive study of the long-range interaction of the 39 K(4s) ϩ 39 K(4p) asymptotic system. We present a detailed discussion of the R-dependent angular momentum couplings and correlation between the Hund's case ͑a͒ and case ͑c͒ molecular states. Analytical expressions for the 16 adiabatic Hund's case ͑c͒ long-range potential curves are derived including the higher order dispersion forces and the effects of retardation. Experimentally, six Hund's case ͑c͒ long-range molecular states ͑0 u ϩ , 1 g , and 0 g Ϫ dissociating to the 4 2 S 1/2 ϩ4 2 P 3/2 asymptote and 0 u ϩ , 1 g , and 0 g Ϫ to the 4 2 S 1/2 ϩ4 2 P 1/2 limit͒ are observed with rovibrational resolution by photoassociative spectroscopy of ultracold 39 K atoms in a high density magneto-optical trap ͑MOT͒. Among the six observed long-range states, the upper 0 g Ϫ ''pure long-range'' state has negligible short-range chemical exchange contributions and the measured molecular binding energies (vϭ0 -26) are used to precisely determine the long-range potential constants of the 4sϩ4 p interaction. We determine: C 3 ⌸ ϭ8.436(14) a.u., C 3 ⌺ ϭ16.872(28) a.u., C 6 ⌸ ϭ6272(94) a.u., and C 6 ⌺ ϭ9365(141) a.u.. Molecular constants for the three special pure long-range states, the 0 g Ϫ and 1 u ͑dissociating to the 4 2 P 3/2 limit and with potential minimum͒ and the 1 u ͑dissociating to the 4 2 P 1/2 and with potential maximum͒, are reported. The internal consistency of the theoretical model used in this work is confirmed by the excellent agreement between the long-range potential curve of the 1 g state obtained in present work ͑from the 0 g Ϫ state͒ and the long-range portion of the RKR potential curve of the 1 1 ⌸ g state previously determined by conventional molecular spectroscopy. The radiative lifetime of the K 4 p state derived from the dipole-dipole interaction constant C 3 ⌸ is also in excellent agreement with a recent fast-beam measurement.

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Optical Suppression of Photoassociative Ionization in a Magneto-Optical Trap

Cited by 58 publications

References 14 publications

Photoassociation of Ultracold Atoms: A New Spectroscopic Technique

Photoassociation of Ultracold Atoms: A New Spectroscopic Technique

Optical shielding of cold collisions in blue-detuned near-resonant optical lattices

Long-range interaction of the 39K(4s)+39K(4p) asymptote by photoassociative spectroscopy. I. The g− pure long-range state and the long-range potential constants

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