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Search Publications by: Eite Tiesinga (Fed)

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Displaying 151 - 175 of 373

Manipulation of the Collisional Frequency Shift in Caesium Fountain Clocks

September 13, 2007
Author(s)
K Szymaniec, W Chalupczak, S Weyers, R. Wynands, Eite Tiesinga, Carl J. Williams
The frequency shift due to atomic collisions is a major, and in some cases the dominant, limitation to the accuracy of caesium fountain primary frequency standards. A correction for this shift is usually obtained by measuring the frequency of the standard

Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks

April 13, 2007
Author(s)
K Szymaniec, W Chalupczak, Eite Tiesinga, Carl J. Williams, S Weyers, R. Wynands
We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular, is zero for a given fraction of the |F = 4, mF = 0> atoms, depending on the initial cloud

Determination of the Scattering Length of the a3Sigma+ Potential of 87RbCs

February 8, 2007
Author(s)
Eite Tiesinga, M Anderlini, E Arimondo
We have determined the scattering length of the a3Sigma+ potential of 87RbCs based on experimental observations from the literature and the known value for the long-range dispersion coefficient. Our analysis uses quantum defect theory and analytical

Effective-Range Description of a Bose Gas Under Strong Confinement

January 29, 2007
Author(s)
Pascal Naidon, Eite Tiesinga, William F. Mitchell, Paul S. Julienne
We point out in this paper that previous theories describing s-wave collisions of atomic bosons confined in 1D or 2D geometries can be extended to much tighter confinements by simply replacing the scattering length by the effective energy-dependent

Light Force in Ultracold Photoassociation

January 26, 2007
Author(s)
Eduardo Gomez, A T. Black, Lincoln Turner, Eite Tiesinga, Paul D. Lett
We study the time-resolved photoassociation of ultracold sodium in an optical dipole trap. The photoassociation laser excites pairs of atoms to molecular states of large total angular momentum at high intensities (above 20 kW/cm2). Such transitions are

Stationary Phase Approximation for the Strength of Optical Feshbach Resonances

August 7, 2006
Author(s)
R Ciurylo, Eite Tiesinga, Paul S. Julienne
Analytic expressions for the width and shift of a photoassociative resonance or an optically induced Feshbach resonance in ultra-cold collisions are derived using the quasi-classical stationary phase approximation. This approach is applicable over a wider

Controlling Polar Molecules in Optical Lattices

April 17, 2006
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga
We determine conditions for effective quantum control over internal and external degrees of freedom of polar alkali-metal molecules in optical lattices. We show that a relatively modest laser intensity is needed for strong confinement of polar molecules in

Ab Initio Relativistic Calculation of the RbCs Molecule

October 28, 2005
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga
We apply the relativistic configuration interaction valence bond method to calculate various characteristics of the alkali-metal RbCs dimer. These include the electronic potentials and transition dipole moments between the ground and first excited states