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Verruno, Marina S.
Universite Paris-Saclay, Ecole doctorale no. 576 Particules hadrons energie et noyau - instrumentation, image, cosmos et simulation - pheniics, Espace Technologique, Immeuble Discovery, Route de l'Orme aux Merisiers RD 128, 91190 Saint-Aubin (France); Universite Paris Sud, IPNO (France)2017
Universite Paris-Saclay, Ecole doctorale no. 576 Particules hadrons energie et noyau - instrumentation, image, cosmos et simulation - pheniics, Espace Technologique, Immeuble Discovery, Route de l'Orme aux Merisiers RD 128, 91190 Saint-Aubin (France); Universite Paris Sud, IPNO (France)2017
AbstractAbstract
[en] Secondary ion mass spectrometry (SIMS) instruments need to be improved in order to satisfy the demands of trends in many fields that require analytical tools that can map samples with both excellent resolution and high-sensitivity chemical information, but also with shorter time of analysis. The objectives of this thesis are: investigate the enhancement of the mass resolution of double focusing mass spectrometers by replacing the standard spherical sector with a novel spheroid geometry which has better focusing properties, and to investigate the reduction of the time of analysis in imaging SIMS by the proof-of-concept of the SIMS multi-ion- beam system. A comparison in a Nier-Johnson configuration between the spherical sector and the spheroid, showed that the beam presents a broadening of the envelope at the exit of the magnet harming the mass resolution in the last case. With a magnet especially designed for the spheroid optics the performance could be improved. A comparison of the performances between the spherical and hybrid sectors simulated in a Mattauch-Herzog configuration, showed that when the double focusing condition is properly satisfied, better mass resolution could be achieved with the spheroid geometry. The proof-of-concept of the multi-ion-beam to reduce drastically the time of analysis was done by simulations and experiments in the Cameca IMS 6F, where a multi-hole aperture was mounted in the primary column generating 9 and 16 beams of sizes between 4 μm to 10 μm. Images of an AlCu grid were obtained when the multi-ion-beam system was scanned over the sample. (author)
[fr]
Les instruments de spectrometrie de masse a ionisation secondaire (SIMS) doivent etre ameliores afin de satisfaire les exigences et tendances dans de nombreux domaines qui demandent des outils d'analyse pouvant cartographier les echantillons a la fois avec une excellente resolution et une haute sensibilite chimique, mais egalement avec des temps d'analyse plus court. Les objectifs de cette these sont: rechercher a ameliorer la resolution en masse des spectrometres de masse a double focalisation en remplacant le secteur spherique standard par une nouvelle geometrie spheroide ayant de meilleures proprietes de focalisation, et d'etudier la reduction du temps d'analyse en imagerie SIMS, par la preuve de concept du systeme SIMS a multifaisceaux d'ions. Une comparaison dans une configuration Nier-Johnson entre le secteur spherique et le spheroide, a montre que le faisceau presente un elargissement de l'enveloppe a la sortie de l'aimant nuisant a la resolution de masse dans la configuration spheroide. Avec un aimant specialement concu pour l'optique spheroide, le performance pourrait etre amelioree.. Une comparaison des performances entre les secteurs spherique et hybride dans une configuration Mattauch-Herzog a montre que lorsque la double condition de focalisation est optimisee, une meilleure resolution de masse pourrait etre obtenue avec la geometrie spheroide. La preuve du concept d'une sonde multi-faisceaux pour minimiser le temps d'acquisition a ete achevee par simulations et experimentalement dans l'IMS 6F de Cameca ou une ouverture a trous multiples etait montee dans la colonne principale, generant 9 et 16 faisceaux de tailles comprises entre 4 μm a 10 μm. Des images d'une grille AlCu ont ete obtenues en balayant l'echantillon par le systeme de multifaisceaux d'ions. (auteur)Original Title
Recherche sur l'amelioration de la performance des instruments SIMS
Primary Subject
Source
6 Nov 2017; 191 p; 140 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; These de doctorat de l'Universite Paris-Saclay, Specialite: Physique des accelerateurs
Record Type
Miscellaneous
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Thesis/Dissertation
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ANGULAR DISTRIBUTION, APERTURES, BEAM FOCUSING MAGNETS, BEAM OPTICS, CESIUM IONS, COMPUTERIZED SIMULATION, DUOPLASMATRONS, ELECTROSTATIC ANALYZERS, ELECTROSTATIC LENSES, IMAGE PROCESSING, ION BEAMS, ION MICROPROBE ANALYSIS, MASS RESOLUTION, MASS SPECTROSCOPY, QUADRUPOLES, SPHERICAL CONFIGURATION, SPHEROIDS, SPUTTERING, TIME-OF-FLIGHT SPECTROMETERS
BEAM ANALYZERS, BEAMS, CHARGED PARTICLES, CHEMICAL ANALYSIS, CONFIGURATION, DISTRIBUTION, EQUIPMENT, ION SOURCES, IONS, LENSES, MAGNETS, MEASURING INSTRUMENTS, MICROANALYSIS, MULTIPOLES, NONDESTRUCTIVE ANALYSIS, OPENINGS, PLASMA ION SOURCES, PLASMATRON ION SOURCES, PROCESSING, RESOLUTION, SIMULATION, SPECTROMETERS, SPECTROSCOPY
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