Reactions of cationic gold clusters in a radio frequency ion trap under multi-collision conditions [Elektronische Ressource] : coadsorption phenomena and activation of molecular oxygen and methane / vorgelegt von Sandra Marianne Lang

Reactions of Cationic Gold Clusters in aRadio Frequency Ion Trap underMulti-Collision Conditions: CoadsorptionPhenomena and Activation of MolecularOxygen and MethaneDissertationzur Erlangung des Doktorgrades Dr. rer. nat.der Fakult¨at fu¨r Naturwissenschaftender Universit¨at Ulmvorgelegt vonSandra Marianne Langaus Wu¨rzburg2009amtierender Dekan: Prof. Dr. Peter B¨auerle1. Gutachter: Prof. Dr. Thorsten M. Bernhardt2. Gutachter: Prof. Dr. Harold JonesTag der Promotion: 17.07.2009Man sieht oft etwas hundert Mal, tausend Mal,ehe man es zum allerersten Mal wirklich sieht.Christian MorgensternSummaryThe aim of the present work was to determine reactivity patterns and general conceptsthatareimportanttotheanalysisofthecatalyticC H andCH oxidationreactionson3 6 4gold particles by experimentally investigating small mass selected gold cluster cationsin the gas-phase under well defined reaction conditions.+InafirstsetofexperimentsthetemperaturedependentreactivityofAu (x=2-7)xtowards several for the hydrocarbon oxidation relevant small molecules (O , H , N ,2 2 2CH , and C H ) were investigated separately and unexpected reactant and cluster size4 3 6dependent reactivity patterns were identified. While the gold cations were found to+be completely unreactive towards molecular oxygen, Au show a distinct temperaturexdependent reactivity towards H and N .