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Displaying 2526 - 2550 of 3361

Observation of Anomalous Spin-State Segregation in a Trapped Ultracold Vapor

February 1, 2002
Author(s)
H J. Lewandowski, D M. Harber, D Whitaker, Eric A. Cornell
We observe counter-intuitive spin segregation in an inhomogeneous sample of ultra-cold, non-condensed, magnetically trapped Rubidium atomswith effectively two internal spin states. We use spatially selective microwave spectroscopy to verify a simple model

Exploring a Quantum Degenerate Fermi Gas

February 1, 2001
Author(s)
Deborah S. Jin, B. L. DeMarco, S Papp
We discuss the production and study of a quantum degenerate Fermi gas of atoms. The fundamental difficulty in cooling a gas of fermionic atoms is the lack of rethermalizing collisions in a spin-polarized sample. We overcome this difficulty using

Onset of Fermi Degeneracy in a Trapped Atomic Gas

September 1, 1999
Author(s)
B. L. DeMarco, Deborah S. Jin
An evaporative cooling strategy that uses a two-component Fermi gas was employed to cool a magnetically trapped gas of 7 x 10 5 40K atoms to 0.5 of the Fermi temperature T f. In this temperature regime, where the state occupation at the lowest energies has

Trapped Bose-Einstein Condensates at Finite Temperature: A Two-Gas Model

January 1, 1998
Author(s)
Karen G. Burnett, M Edwards, Charles W. Clark, R J. Dodd
A simple picture describes the results of recent treatments of partially-condensed, dilute, trapped Bose gases at temperature T>O. The condensate wavefunction is nearly identical to that of a T=O condensate with the same number of condensate atoms, No. The

Improved measurements of the hyperfine structure of 87 Rb5P 3/2 state

August 1, 1996
Author(s)
J Ye, S Swartz, P Jungner, John L. Hall
We have constructed two highly stable and reproducible Rb D 2 saturated absoption spectrometers at 780 nm, using rf frequency sideband technique and third harmonic dither lockin detection method respectively. We have achieved +or-}3 kHz reproducibility on

Spin and Energy Analyzed Secondary Electron Emission from a Ferromagnet

July 5, 1982
Author(s)
John Unguris, Daniel T. Pierce, A Galejs, Robert Celotta
Measurements are presented of the energy dependence of the spin polarization of low-energy (0.5-25 eV) secondary electrons when a 500-eV primary beam is incident on an iron-based ferromagnetic glass. The polarization of the lowest-energy electrons is found
Displaying 2526 - 2550 of 3361
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