A novel technique to monitor ultrafast photoinduced chemical reaction dynamics at surfaces: the femtochemistry of methyl halide molecules adsorbed on oxides, metals and oxide supported metal clusters
Vaida, Mihai E.
FacultiesFakultät für Naturwissenschaften
LicenseStandard (Fassung vom 01.10.2008)
The aim of this thesis was to monitor the dynamics of chemical reactions of molecules adsorbed on solid surfaces in real-time by direct detection of reaction intermediates and products. To realize this goal a new experimental technique was developed. The novel experimental approach enables the time-resolved investigation of photoinduced surface reaction dynamics via multi-photon ionization of transition states, intermediates, and products directly at the surface in a pump-probe laser mass spectrometry schema. To demonstrate the viability of the new technique, the photoinduced reaction dynamics of methyl iodide and methyl bromide molecules adsorbed at sub-monolayer coverage on (i) ultra-thin magnesia films, on (ii) a gold surface and on (iii) magnesia supported gold clusters and nanoparticles were investigated.
Subject HeadingsREMPI [GND]
Mass spectrometry [LCSH]
Surface chemistry [LCSH]