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Displaying 49226 - 49250 of 73832

Giving a Boost to Atoms

December 1, 1999
Author(s)
Kristian Helmerson
Matter waves can now be amplified in the same way that a laser amplifies light. Such matter-wave amplifiers will be essential for future developments in atom optics.

High Temperature Deformation of Silicon Nitride

December 1, 1999
Author(s)
Sheldon M. Wiederhorn
Three mechanisms for the creep of silicon nitride are discussed with regard to the microstructural variables that control creep. During the initial stages of creep, the amorphous silicate layer that coats all grains of silicon nitride is displaced from

High-Speed Resonant Cavity Enhanced Photodiodes

December 1, 1999
Author(s)
M. S. {Umlat}nl{umlat}, E. Vzbay, E. Towe, Richard Mirin, David H. Christensen
We have demonstrated RCE Schottky phodiodes with GaAs absorption regions in AlGaAs/AlAs microcavities (3).

Hydrodynamic Excitations for a Trapped Fermi Gas

December 1, 1999
Author(s)
G M. Bruun, Charles W. Clark
We discuss collective excitations of a trapped dilute Fermi gas within a hydrodynamic approximation. Analytical results are derived for both high- and low -temperature limits and are applied to 40K and 6Li systems of current experimental interest. We

Ion-Molecule Reactions and Ion Energies in CF 4 Discharges

December 1, 1999
Author(s)
B. Peko, I. V. Dyakov, R. Champion, MVVS. Rao, James K. Olthoff
Absolute cross sections have been measured for reactants typically found in carbon tetrafluoride (CF 4) discharges for collision energies below a few hundred electron volts. The reactions investigated include collision-induced dissociation and dissociative
Displaying 49226 - 49250 of 73832
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