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. Au-voisinage-de-la-condensation-de-bose-einstein, un gaz dilué d'hélium métastable (He 2 3 S) sont gouvernées par les collisions Penning ionisantes, et par la longueur de diffusion Afin de sonder ces propriétés, de nouvelles expériences de photo-association (PA) ontétéontété entreprises dans lesquelles une paire d'atomes métastables absorbe un photon pour former une moléculé electroniquement excitée. En particulier, des " dimères géants " ontétéontété produits, pour lesquels l'auto-ionisation est inhibée. Des spectres de raies ontétéontété mesurés avec une grande précision par une méthode originale de détection

. Mots-clés, Atomes ultra-froids, hélium métastable, condensation de Bose-Einstein, longueur de diffusion, photo-association, potentielsàpotentiels`potentielsà purement longue portée

P. In, M. Helium, . In, . Vicinity, . Of et al., In the vicinity of Bose-Einstein condensation, the collisional properties of a dilute gas of metastable helium (He 2 3 S) are governed by the rate of ionizing Penning collisions and the s-wave scattering length In order to investigate these properties, we have carried out new photoassociation experiments in which a pair of free atoms absorbs a photon to produce a molecule in an excited electronic state. In particular, we have observed " giant dimers " for which the autoionizing process is inhibited. Accurate spectra have been acquired by the use of an original " calorimetric " detection scheme, addition, we have calculated long-range electronic potentials for the 2 3 S + 2 3 P system. Our asymptotic approach is described in detail, which reproduces the measured binding energies of the giant dimers with very good accuracy