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The colloquia will be held at 4:30 p.m in Jefferson Lab 356 with tea served at 4 p.m. [unless otherwise stated]

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February, 2000

February 2: Wednesday, 4:30 p.m., Jefferson 356
Dr. Mikhail Lukin	ITAMP	"Nonlinear Optics and Quantum Entanglement with Electromagnetically Induced Transparency"
February 16: Wednesday, 4:30 p.m., Jefferson 356
Dr James Anglin	ITAMP	"Black Holes in Bose Einstein Condensates"

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March, 2000

March 8: Wednesday, 4:30 p.m., Jefferson 356
Prof. Giacinto Scoles	Princeton University	"Spectroscopy of metal atoms and oligomers in and on liquid helium nanodroplets"
March 29: Wednesday, 4:30 p.m., Jefferson 356
Dr. Eddy Timmermans	Los Alamos National Lab	"Cold atom traps: old and new aspects of superfluidity"

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April, 2000

April 12: Wednesday, 4:30 p.m., Jefferson 356
Dr Chandra Raman	M.I.T.	"Shaking and Stirring a Quantum Gas: Light Forces and Bose-Einstein Condensates" [Abstract]
April 26: Wednesday, 4:30 p.m., Jefferson 356
Prof. Marjatta Lyyra	Temple University	"Prospects for All-Optical Control of Molecular Alignment and RadiativeProcesses"

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May, 2000

May 3: Wednesday, 4:30 p.m., Jefferson 356
Prof. Philip Bucksbaum	University of Michigan	"Wavepacket sculpting and learning algorithms"
May 10: Wednesday, 4:30 p.m., Jefferson 356
Prof. E.A. Hinds	University of Sussex	"Atomic Mirrors, Waveguides and Chips"
May 17: Wednesday, 4:30 p.m., Jefferson 356
Prof. Moshe Shapiro	The Weizmann Institute of Science	"Coherent Control of symmetry breaking and chiral molecules purification"

September, 2000

September 20: Wednesday, 4:30 p.m., Jefferson 356
Prof. John E. Thomas	Duke University	"Optical Confinement of a Fermi Gas"

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October, 2000

October 4: Wednesday, 4:30 p.m., Jefferson 356
Prof. Luis Orozco	SUNY at Stony Brook	"Francium Spectroscopy, Recent Advances and Future Directions"
October 18: Wednesday, 4:30 p.m., Jefferson 356
Prof. Francis Robicheaux	Auburn University	"Pulsed Field Recombination e + p = H (slowly)"
October 25: Wednesday, 4:30 p.m., Jefferson 356
Prof. David Weiss	Univ. of California, Berkeley	"Light scattering in 3D optical lattices, atomic collisions in 2D and 1D optical lattices"

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November, 2000

November 1: Wednesday, 4:30 p.m., Jefferson 356
Prof. Wonho Jhe	Seoul National University	"Atom Optics in Hollow Optical Systems"
November 15: Wednesday, 4:30 p.m., Jefferson 356
Prof. C. Lewis Cocke	Kansas State Univ.	"Ion and Electron Momentum Imaging Applied to Charged-particle and Photon Interactions with Atoms and Molecules" [Abstract]
November 29: Wednesday, 4:30 p.m., Jefferson 356
Prof. Li You	Georgia Institute of Technology	"Quantum Computing with Trapped Atoms and Photons"

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December, 2000

December 13: Wednesday, 4:30 p.m., Jefferson 356
Dr. Jens Gundlach	Univ. of Washington	"New measurement of gravitational constant G" [Abstract]

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Abstracts

"Shaking and Stirring a Quantum Gas: Light Forces and Bose-Einstein Condensates"  Dr. Chandra Raman MIT Bose-Einstein condensates of trapped atomic gases are a new quantum fluid. Suspended by magnetic forces in the midst of ultra-high vacuum, an ensemble of weakly interacting atoms cooled to nanoKelvin temperatures exhibits a wealth of collective phenomena, including collective excitations, topological properties such as vortices, and mean-field driven superfluid hydrodynamics. Unlike their counterparts in the condensed matter world, these quantum fluids can be manipulated using tools from atomic physics, in particular with laser light. Using the optical dipole forces from far detuned laser beams, we can focus on Bose condensates with repulsive or attractive potentials, move them at will, and study their excitations. We have recently implemented optical forces to look for phenomenological signatures of superfluid behavior, including dissipation-free flow, and to create surface excitations of a controlled symmetry. I will describe these experiments with an emphasis on how the simplicity of these atomic systems can give us insights into many-body phenomena.

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Ion and Electron Momentum Imaging Applied to Charged-particle and Photon Interactions with Atoms and Molecules C.L.Cocke J.R.Macdonald Laboratory Physics Dept. Kansas State Univ. Manhattan, KS 66506 COLTRIMS (COLd Target Recoil Ion Momentum Spectroscopy) combines fast imaging detectors with a supersonically cooled gas target to allow the charged particles from any ionizing collision, including both recoil ions and electrons, to be collected with extremely high efficiency and with fully measured vector momenta. Since all particles are measured in event mode, the full multi-dimensional momentum space is mapped. I will review several examples of the use of this technique to study two- , three- and four-body final states created in ionizing interactions of photons and charged particles with He, CO and D2 . The examples may include: (1) Low-energy continuum electron production shows evidence for molecular orbitals promoted into the continuum;(2) Capture from D2 by very slow Xe 26+ projectiles shows Coulomb explosion peaks modified by tidal forces exerted on the fragments by the projectiles; (3) Photodisintegration of CO by synchrotron light near C K edge show strong diffraction images of the outgoing electron waves characteristic of the molecular potential; (4) Application of the technique to the double ionization of D2 short intense laser pulses reveals a Coulomb explosion peak not visible with previous approaches.

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Big G and Gravity Close Up Dr. Jens Gundlach   University of Washington Newton's constant ,G, is one of the most fundamental and universal constants in nature, yet its accepted value is by far more uncertain than that of all the other physical constants. We have developed a new torsion balance technique, with many novel and remarkable features, that allowed us to determine G with unprecedented precision. With another apparatus we are testing Newton's inverse square law at sub-mm distances to search for extra dimensions.