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Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

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Accueil du site > Séminaires > LAC > Stark and Zeeman deceleration of atoms and molecules

Stark and Zeeman deceleration of atoms and molecules

Séminaire de Frédéric Merkt (Laboratorium für Physikalische Chemie, ETH Zurich, Switzerland and Laboratoire Aimé Cotton du CNRS, Orsay, France)

New experimental results on the manipulation of the translational motion of atoms and molecules in the gas phase using inhomogeneous electric and magnetic fields will be presented. In the experiments, cold atoms or molecules moving at high speed in the laboratory reference frame in supersonic beams are slowed down to low velocity, mirrored and loaded in electrostatic or magnetic traps. Two methods developed in Zurich in the past years will be described in detail with the example of atomic and molecular hydrogen : In the first, hydrogen is excited to Rydberg Stark states with a large dipole moment, decelerated by time-dependent inhomogeneous electric fields and loaded in electrostatic traps.

In the second, the ground state atoms are decelerated in a multistage Zeeman decelerator consisting of an array of solenoids though which high currents are switched on an off rapidly and loaded into a magnetic trap. The motivations for these experiments and future plans will also be presented.

C.N.R.S./Laboratoire AIME COTTON, Bâtiment 505, Campus d’Orsay 91405 - ORSAY Cedex

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Internet : http://www.lac.u-psud.fr

Contacts séminaires : Jean-Pierre GALAUP, Laurence PRUVOST (01 69 35 21 01)