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Search Publications by: Eite Tiesinga (Fed)

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Displaying 101 - 125 of 197

Scattering Length Determination From Trapped Pairs of Atoms

August 2, 2005
Author(s)
S Shresta, Eite Tiesinga, E L. Bolda, Carl J. Williams
A method is described for estimating effective scattering lengths via spectroscopy on a trapped pair of atoms. The method relies on the well known phenomena that the energy levels of two atoms in a harmonic trap are shifted by their collisional interaction

Observation of Feshbach Resonances in an Ultracold Gas of 52 Cr

May 9, 2005
Author(s)
J Werner, A Griesmaier, S Hensler, J Stuhler, Tilman Pfau, Andrea Simoni, Eite Tiesinga
We have observed Feshbach resonances in elastic collisions between ultracold 52Cr atoms. This is the first observation of collisional Feshbach resonances in an atomic species with more than one valence electron. The zero nuclear spin of 52Cr and thus the

Precise Determination of 6 Li Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules

March 1, 2005
Author(s)
M Bartenstein, A Altmeyer, S Riedl, R Geursen, S Jochim, C Chin, J Hecker Denschlag, R Grimm, Andrea Simoni, Eite Tiesinga, Carl J. Williams, Paul S. Julienne
Radio-frequency spectroscopy on weakly bound 6Li_2 molecules determines to high precision the molecular binding energies and the energy splitting between molecular states. By fitting the measurement to a multi-channel quantum scattering model, we determine

Adaptive Grid Refinement for a Model of Two Confined and Interacting Atoms

February 1, 2005
Author(s)
William F. Mitchell, Eite Tiesinga
We have applied adaptive grid refinement to solve a two-dimensional Schroedinger equation in order to study the feasibility of a quantum computer based on extremely-cold neutral alkali-metal atoms. Qubits are implemented as motional states of an atom

Feshbach Resonances in Fermionic 6 Li

January 1, 2005
Author(s)
C H. Schunck, M W. Zwierlein, C A. Stan, S M. Raupach, W Ketterle, Andrea Simoni, Eite Tiesinga, Carl J. Williams, Paul S. Julienne

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
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