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Search Publications by: Eite Tiesinga (Fed)

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Displaying 101 - 125 of 187

Spontaneous Dissociation of Long-Range Feshbach Molecules

January 1, 2005
Author(s)
T K hler, Eite Tiesinga, Paul S. Julienne
We study the spontaneous dissociation of diatomic molecules produced in cold atomic gases via magnetic field tunable Feshbach resonances. We provide a universal formula for the lifetime of these molecules that relates their decay to the scattering length

Photoassociative Formation of Ultracold Polar KRb Molecules

November 1, 2004
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga, Paul S. Julienne
We investigate the effectiveness of creating polar ground state KRb molecules by two-color photoassociative spectroscopy. In this process the molecules are formed from ultra-cold samples of K and Rb. Focussing on spin-polarized atoms we show that an

Adiabatic Association of Ultracold Molecules via Magnetic Field Tunable Interactions

September 14, 2004
Author(s)
K Goral, T Koehler, S A. Gardiner, Eite Tiesinga, Paul S. Julienne
We consider in detail the situation of applying a time dependent external magnetic field to a 87Rb atomic Bose-Einstein condensate held in a harmonic trap, in order to adiabatically sweep the interatomic interactions across a Feshbach resonance to produce

Precision Feshbach Spectroscopy of Ultracold Cs-2

September 1, 2004
Author(s)
C Chin, Vladan Vuletic, A J. Kerman, S G. Chu, Eite Tiesinga, P J. Leo, Carl J. Williams
We have observed > 60 magnetic field-induced Feshbach resonances in ultra-cold collisions of ground-state cesium atoms. The resonances have been detected using three different scattering processes: elastic collisions, inelastic collisions and radiative

Making Cold Molecules by Time-Dependent Feshbach Resonances

August 1, 2004
Author(s)
Paul S. Julienne, Eite Tiesinga, T Kohler
Pairs of trapped atoms can be associated to make a diatomic molecule using a time dependentMagnetic field to ramp the energy of a scattering resonance state from above to below the scatteringthreshold. A relatively simple model, parameterized in terms of

Beam-Loss Spectroscopy of Cold Collisions in a Bright Sodium Beam

April 1, 2004
Author(s)
J Ramirez-Serrano, W DeGraffenreid, J Weiner, Eite Tiesinga, Paul S. Julienne
We report beam loss photoassociation (PA) spectra of cold collisions within a slow, bright Na atom beam near the D1 resonance line. The high collimation and brilliance of the atomic beam permits the detection of atomic fluorescence loss resulting from the

Ballistic Expansion and Collisions in the Cs Atomic Fountain Clock

January 1, 2004
Author(s)
V Venturi, Eite Tiesinga, Carl J. Williams
We study the effects of the ballistic expansion of an atomic cloud on theoretical predictions of the collisional shifts in the Cesium atomic fountain clock. Due to the strong energy dependence of the collisional shift, we find that the ballistic expansion

Effects of Inhomogeneity on the Spectrum of the Mott-Insulator State

December 1, 2003
Author(s)
G Pupillo, Eite Tiesinga, Carl J. Williams
We investigate the existence of quantum quasi phase transitions for an ensemble of ultracold bosons in a one-dimensional optical lattice, performing exact diagonalizations of the Bose-Hubbard Hamiltonian. When an external parabolic potential is added to

Ab Initio Calculation of the KRb Dipole Moments

August 1, 2003
Author(s)
Svetlana A. Kotochigova, Paul S. Julienne, Eite Tiesinga
The relativistic configuration interaction valence bond method has been used to calculate permanent and transition electric dipole moments of the KRb heteronuclear molecule as a function of internuclear separation. The permanent dipole moment of the ground