Kinetic and Spectroscopic Characterization of N2 and H2 Activation by Tantalum Clusters under Cryo Conditions
- The present thesis reports on studies of atomically precise, size-selected tantalum cluster ions \(Ta_n^±\) under cryogenic conditions in a FT-ICR mass spectrometer with respect to surface adsorbate interactions at the fundamental level, focusing on \(N_2\) and \(H_2\) adsorption and activation. The wealth of results presented here is the result of systematic studies that have revealed valuable kinetic, spectroscopic, and quantum chemical information, which together paint a comprehensive picture of the elementary adsorption steps and mechanisms in detail. The \(N_2\) and \(H_2\) adsorption processes to \(Ta_n^+\) clusters exhibit dependencies on cluster size n and on adsorbate load. In terms of \(N_2\) adsorption, there is evidence for spontaneous \(N_2\) activation and cleavage by \(Ta_2^+\) - \(Ta_4^+\), while it appears to be suppressedby \(Ta_5^+\) - \(Ta_8^+\). The activation and cleavage of \(N_2\) molecules proceeds across surmountable barriers and along much-involved multidimensional reaction paths. Underlying reaction processes and involved intermediates are elucidated. Two different processes are characteristic of \(H_2\) adsorption: There are fast adsoprtion processes without competing desorption reactions at low \(H_2\) loadings, indicating dissociative adsorption processes, followed by slow adsorption reactions accompanied by multiple desorption reactions at high \(H_2\) loadings, indicating molecular \(H_2\) adsorption. The threshold is the completion of the first adsorbate shell. The \(N_2\) adsorption study of \(Ta_n^-\) clusters revealed that the \(N_2\) adsorption ability of anionic tantalum clusters depends strongly on cluster size n. The cluster size n = 9 is the minimum size for \(N_2\) adsorption onto \(Ta_n^-\) clusters to yield stable and detectable cluster adsorbate species \([Ta_n(N_2)_m]^-\).
Verfasser*innenangaben: | Daniela Veronika FriesORCiD |
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URN: | urn:nbn:de:hbz:386-kluedo-75791 |
DOI: | https://doi.org/10.26204/KLUEDO/7579 |
Betreuer*in: | Gereon Niedner-SchatteburgORCiD |
Dokumentart: | Dissertation |
Kumulatives Dokument: | Ja |
Sprache der Veröffentlichung: | Englisch |
Datum der Veröffentlichung (online): | 12.12.2023 |
Jahr der Erstveröffentlichung: | 2023 |
Veröffentlichende Institution: | Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau |
Titel verleihende Institution: | Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau |
Datum der Annahme der Abschlussarbeit: | 12.09.2023 |
Datum der Publikation (Server): | 14.12.2023 |
Seitenzahl: | XI, 422, IX-XXIII |
Fachbereiche / Organisatorische Einheiten: | Kaiserslautern - Fachbereich Chemie |
DDC-Sachgruppen: | 5 Naturwissenschaften und Mathematik / 540 Chemie |
Lizenz (Deutsch): | Creative Commons 4.0 - Namensnennung, nicht kommerziell, keine Bearbeitung (CC BY-NC-ND 4.0) |