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Développement d'un détecteur sans temps mort sensible en temps et en position : Application à l'étude des collisions de petits agrégats d'argon Ar+n sur une cible d'argon

Abstract : The aim of this work is the development of a fast multi-hit position and time sensitive detector with zero dead-time for heavy particles in the keV energy range. This new type of detector makes use of a micro-channel plates MCP assembly and combines a detection based on delay line anode with a simultaneous particle imaging provided by CCD-camera. The time pickup accuracy is enhanced by digitalizing the MCP biasing signal. This detector, operating at kHz repetition rate, allows a position resolution better than 100 µm and a time resolution better than 100 ps to be achieved.

We have studied the fragmentation induced by collision of small ionic argon clusters (Ar2+ and Ar3+) with an atomic argon target at keV energies range. All the fragmentation channels: collision induced dissociation (CID) and dissociative charge transfer (DCT) have been analysed by the method of vectorial correlation of all the fragments detected in coincidence. The importance of electronic processes in these collision systems is demonstrated through various results. The dependence of the electron transfer on the initial internal energy of the cluster has been stressed out. Ar3+ has been found to be mainly formed of a strongly bound Ar2+ core surrounded by loosely linked Ar atom.
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Submitted on : Wednesday, January 4, 2006 - 3:16:25 PM
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Iyas Ismail. Développement d'un détecteur sans temps mort sensible en temps et en position : Application à l'étude des collisions de petits agrégats d'argon Ar+n sur une cible d'argon. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011289⟩

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