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Search Publications by: Paul D. Lett (Assoc)

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Displaying 76 - 100 of 184

Two-Color Photoassociation Spectroscopy of the Lowest Triplet Potential of Na 2

July 1, 2003
Author(s)
L E. de Araujo, J D. Weinstein, S D. Gensemer, F K. Fatemi, Kevin Jones, Paul D. Lett, Eite Tiesinga
We have performed a type of Autler-Townes spectroscopy to locate a number of rovibrational hyperfine levels of the a ^3^ς + u potential, the lowest triplet potential of the Na 2 dimer. The spectroscopy starts with the photoassociation of ultracold atoms in

Ultracold Ground-State Molecule Production in Sodium

November 1, 2002
Author(s)
F K. Fatemi, Kevin Jones, Paul D. Lett, Eite Tiesinga
We have observed the formation of ground state Na 2 molecules via the spontaneous decay of excited molecules created by the photoassociation of ultracold atoms. We measure the energies of ground state molecules formed in three hyperfine components of the

Photoassociation in a Bose-Einstein Condensate

August 1, 2002
Author(s)
Paul D. Lett
Two colliding atoms can absorb a photon and be photoassociated into an excited, diatomic molecule, NIST researchers investigated the fundamental rate at which this process can take place in a Bose-Einstein condensate (BEC) and demonstrated that simple

Photoassociation of Sodium in a Bose-Einstein Condensate

March 1, 2002
Author(s)
C R. McKenzie, J Denschlag, H Heffner, A Browaeys, L E. de Araujo, F K. Fatemi, Kevin Jones, J E. Simsarian, D Cho, A Simoni, Eite Tiesinga, Paul S. Julienne, Kristian Helmerson, Paul D. Lett, S L. Rolston, William D. Phillips
We report on the formation of ultra-cold Na2 molecules using single-photon photoassociation of a Bose-Einstein condensate. The photoassociation rate, linewidth and light shift of the J = 1, v = 135 vibrational level of the A^1)Sigma^+_u molecular bound

Quantum Encounters of the Cold Kind

March 1, 2002
Author(s)
K Burnett, Paul S. Julienne, Paul D. Lett, Eite Tiesinga, Carl J. Williams
Ultra cold atomic collisions have a broad impact in experimental and theoretical atomic physics. These encounters occur in a domain where the quantum mechanical aspects of the interacting particles are manifest, since the de Broglie wavelength is enormous

Photoassociation of sodium in a BEC

January 1, 2002
Author(s)
C R. McKenzie, J H. Denschlag, H Haffner, A Browaeys, L E. de Araujo, F K. Fatemi, Kevin Jones, J E. Simsarian, D Cho, Andrea Simoni, Eite Tiesinga, Paul S. Julienne, Kristian Helmerson, Paul D. Lett, S L. Rolston, William D. Phillips

Dynamics of Photoinduced Collisions of Cold Atoms Probed with Picosecond Laser Pulses

September 1, 2001
Author(s)
F K. Fatemi, Kevin Jones, H Wang, I Walmsley, Paul D. Lett
Pump-probe experiments are performed in which cold colliding Na atoms are photoassociated to form Na$ _(2)$ molecules, and subsequently ionized. the experiments are performed in a regime where the pulsed photoassociation to an intermediate potential takes