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Implantation d'atomes de césium dans un cristal d'hélium

Abstract : This manuscript deals with the production and spectroscopic studies of cesium atoms embbeded in a hcp helium single crystal near 1.1 K in view of possibly using them for measuring Cs nucleus anapole moment. We have built up an optical cryostat able to keep single oriented crystals for several months. Crystal doping with cesium atoms was made by laser sputtering from metal grains, first with a second harmonic YAG laser and then with an amplified femtosecond Ti:Sa laser.With this new process, cesium atom density is significantly higher while putting less energy inside the crystal. At 1.1 K, optical detection of these atoms reveals that they are trapped in atomic form for a longer time than at 1.6 K. The D2 (6S1/2 --> 6P3/2) absorption line shape suggests an energy level splitting between sub-levels MJ = ±3/2 and ±1/2 around 200 cm−1, in good agreement with theoretical predictions of the energy splitting for a static deformation (6%)
of the atomic bubble. From the intensities of D2 components, we deduce that the high frequency one could be the | MJ |= 1/2 sub-level and as a consequence that the atomic bubble deformation in the ground state should be oblate (like a cushion). We searched for a dependency of the line shape with light polarization. The effects are weaker than expected. This could result either from incident light depolarization by the cryostat windows or from an isotropic distribution of the local anisotropic axis felt by the atoms.
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Contributor : Mathieu Melich <>
Submitted on : Sunday, January 11, 2009 - 4:46:23 PM
Last modification on : Thursday, July 1, 2021 - 5:32:06 PM
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  • HAL Id : tel-00351769, version 1

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Mathieu Melich. Implantation d'atomes de césium dans un cristal d'hélium. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00351769⟩

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