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The population of magnetic sublevels in hydrogen-like uranium ions has been investigated in relativistic ion- atom collisions by observing the subsequent X-ray emission. Using the gas target at the experimental storage ring facility we observed the angular emission of Lyman-α radiation from hydrogen-like uranium ions. The alignment parameter for three different interaction energies was measured and found to agree well with theory. In addition, the use of different gas targets allowed for the electron-impact excitation process to be observed. PACS Nos: 34.10.+x, 34.80.Dp, 33.20.Rm, 32.70.Fw La population des sous-niveaux magnetiques des ions hydrogenoides d'uranium a ete etudiee dans les collisions relativistes ion-atome en observant remission subsequente de rayons-X. Utilisant la cible gazeuse d'un anneau de stockage, nous avons observe remission angulaire du rayonnement Lyman-α d'ions hydrogenoi'des d'uranium. Le parametre d'alignement pour les trois energies d'interaction a ete mesuree et a ete trouve en accord avec la theorie. En outre, l'utilisation de differents types de gaz comme cible a permis l'observation le processus d'excitation par impact electronique. [Traduit par la Redaction], 1. Introduction The polarization and anisotropic emission of atomic radiation is indicative of a preferred direction in space. Such directionality appears in environments with intense charged particle beams, such as [...]

Abstract: We present a new experiment for the accurate study of the intrashell transition 1s2p ³[P.sub.2] → 1s2s ³[S.sub.1] in helium-like uranium near 4.5 keV using a Johann-type Bragg spectrometer [...]