The amazing atom laser

Article Abstract:

The atom laser is a new type of laser that is being developed by Wolfgang Ketterle with a group of researchers from the Massachusetts Institute of Technology. The concept is based on the wave-like behavior of alkali atoms that are classified as Bose-Einstein particles (bosons). The laser is composed of a Bose-Einstein condensate which emits bosons in a narrow beam that escapes via an output condensate. The researchers are also developing new technology that will control the atom beam.

Design and construction, Lasers, Bosons

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Atom bouncers have it taped

Article Abstract:

Experiments are done in which rubidium atoms are made to bounce repeatedly from magnetic tapes. In the experimental set-up, rubidium atoms are collected in a magneto-optic trap consisting of three pairs of below resonance detuned, mutually perpendicular laser beams and a non-uniform magnetic field. For 600 milliseconds, many bounces are seen with about 63% of the atoms falling on magnetized region of tape. About 94% of those atoms that fall on the magnetic region are reflected.

Usage, Magnetism, Magneto-optical devices

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Surface impact ionization of polar-molecule clusters through pickup of alkali atoms

Article Abstract:

Mass analysis of charged SO(sub2) cluster fragments was used to demonstrate a microscopic model of the charging mechanism. Mass spectra showed that positively charged fragments have na alkali ion, while negative fragments are (SO(sub2))-n. The pickup of neutral adatom during impact appears to be the key to charge separation, followed by delocalization of the valence electron of the adatom, and subsequent collision fragmentation.

Molecular beams

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