. Collimation-naturelle-de-l-'ordre-du-milliradian, Le rayonnement estémisestémis dans un cône d'ouverture très faible, dont l'axe est tangentàtangent`tangentà la trajectoire, et la direction orienté vers l'avant

. Source-de-grande-brillance, nombre de photonsémisphotonsémis pendant un secondè a l'intérieur d'une bande de fréquence donnée, divisé par l'angle solide d'´ emission du rayonnement et par l'aire d'une section de la source)

. Structure-temporelle-pulsée, Dans un synchrotron detroisì eme génération (SOLEIL), les particule sont injectées sous forme de paquets, ce qui confère au rayonnement un caractère pulsé dans la gamme du MHz (7 MHz) avec des durées d'impulsion de l'ordre de quelques dizaines de picosecondes (50 ps) Cette caractéristique peut permettre d'accéderaccéderà des information temporelles sur des structuré electroniques

. Fig, B.1 ? Ligne delumì ere SB7 sur l'anneau Super-ACO

N. La-spectroscopie-de-photoélectrons-et-la-spectroscopie, ionisation et de spectres NEXAFS, ont permis de caractériser les blocs chimiques formés lors de l'adsorption de ces nitriles sur la surface Si(001)-2×1: Si-N=C-Si, C=C=N, C?N libre, C?N en interaction dative avec le silicium et le bloc conjugué C=C-C?N. Utilisée enparalì ele avec ces méthodes, la microscopiè a effet tunnel a permis d'identifier pour l'acrylonitrile et le cyanure de vinyle, les sites d'adsorption sur la surface. La combinaison de ces deux approches a ainsi permis de déterminer de façon nonéquivoquenonéquivoque les géométries d'adsorption. LesétudesLesétudes cinétiques temps-réel menées en rendement Auger, ou en bande de valence, montrent que l'adsorption implique dans tous les cas un précurseur moléculaire

. Ce-type-d-'´-etude-pose-d, intéressantes questions pour ce qui est du traitement théorique de la réactivité de surface du silicium. L'accumulation de données expérimentales permettra d'améliorer la modélisation de la structuré electronique du silicium par une prise en compte des effets de solide (relaxation sur plusieurs plans atomiques en profondeur, transfertélectroniquetransfertélectronique

. Dans-les, excursion en pression se limitè a la gamme 10 ?10 -10 ?6 mbar. CONCLUSION Or la pression peut avoir une influence sur la cinétique et la thermodynamique des réactions. La conception d'une expérience fonctionnantàfonctionnant`fonctionnantà pressionélevéepressionélevée (quelques mbar [105]) permet d'ouvrir des champs de rechercheentì erement nouveaux, sur des surfaces non classiques, mais plus proches de l'expérience quotidienne (glace en fusion La mise en place d'un tel schéma expérimental doitêtrédoitêtré etudiée dans l'environnement de la ligne TEMPO, permise par le haut flux de la ligne, p.121

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