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Displaying 101 - 125 of 213

Collisional Frequency Shifts in 133 Cs Fountain Clocks

April 1, 2001
Author(s)
P J. Leo, Paul S. Julienne, F H. Mies, Carl J. Williams
We present a theoretical analysis of the pressure shift in Cs fountain clocks using the highly constrained binary collision model described by Leo et al. [Phys. Rev. Lett. xx, xx (2000)]. We predict a reversal in the pressure shift at temperatures near 0

Ground State Scattering Lengths for Potassium Isotopes Determined by Double-Resonance Photoassociative Spectroscopy of Ultracold 39 K

November 1, 2000
Author(s)
Haonan Wang, A N. Nikolov, J R. Ensher, P L. Gould, E E. Eyler, W C. Stwalley, J P. Burke, J L. Bohn, C H. Greene, Eite Tiesinga, Carl J. Williams, Paul S. Julienne
We use double-resonance photoassociative spectroscopy of ultracold 39K atoms to precisely determine the triplet a 3Σ scattering length for the various isotopes of potassium. Photoassociation of free 39K atoms to the pure long-range 0 (v' = O, J' = 2) level

Reflection Approximation in Photoassociation Spectroscopy

November 1, 2000
Author(s)
C Boisseau, E Audouard, J Vigue, Paul S. Julienne
We construct an analytical wavefunction in the phase-amplitude formalism to describe collisions between two neutral atoms. This wavefunction is valid from intermediate to asymptotic internuclear distance over a large energy range near zero energy; and is

Collision Properties of Ultracold 133 Cs Atoms

September 1, 2000
Author(s)
P J. Leo, Carl J. Williams, Paul S. Julienne
We present a theoretical analysis of numerous magnetically tunable Feshbach resonances measured by Vladan et al. at fields of up to 25 m T. This analysis provides the most accurate characterization of the collisional properties of ground state Cs atoms

Theory of Four-Wave Mixing of Matter Waves from a Bose-Einstein Condensate

August 1, 2000
Author(s)
M Trippenbach, Y B. Band, Paul S. Julienne
A recent experiment [Deng et al., Nature 398, 218 (1999)] demonstrated the four-wave mixing of matter wavepackets created from a Bose-Einstein condensate. The experiment utilized light pulses to create two high-momentum wavepackets via Bragg diffraction

Interacting Atoms Under Strong Quantum Confinement

June 1, 2000
Author(s)
Eite Tiesinga, Carl J. Williams, F H. Mies, Paul S. Julienne
We calculate the energy level shifts of a tightly-confined trapped alkali atom in the presence of a second trapped atom. A complete microscopic description of the interaction energy between the two atoms is used. This allows us to study tightly-confined

Four-Wave Mixing With Multiple Spin States

February 1, 2000
Author(s)
J P. Burke, Carl J. Williams, Paul S. Julienne, Y B. Band, M Trippenbach
Four-wave mixing is a common process in nonlinear optics wherein the nonlinear interaction between light and matter allows three light waves to interact or mix and produce a fourth wave with a different central wavevector (and/or frequency). The

Ultracold Matter - Molecules at Rest

February 1, 2000
Author(s)
Carl J. Williams, Paul S. Julienne
In this issue (1), a group from the University of Texas reports producing rubidium dimers that are essentially at rest, by assembling them from ultracold Rb atoms in an atomic Bose-Einstein condensate (BEC). The report (see page 1016) contains several

Coherence Properties of an Atom Laser

January 1, 2000
Author(s)
M Trippenbach, Y B. Band, M Edwards, M R. Doery, Paul S. Julienne, Edward W. Hagley, Lu Deng, M M. Kozuma, Kristian Helmerson, S L. Rolston, William D. Phillips
We study the coherence properties of an atom laser, which operates by extracting atoms from a gaseous Bose-Einstein condensate via a two-photon Raman process, by analyzing a recent experiment [(Hagley et al., submitted to Phys. Rev. Lett. (1999)]. We
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