Darmstadt 2008 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 17: Elektronische Spektroskopie
MO 17.8: Poster
Dienstag, 11. März 2008, 14:00–19:00, Poster C1
Optical excitation and detection of nitrous oxide in the ultraviolet wavelength range — •Christof Maul — Institut für Physikalische und Theoretische Chemie, Technische Universität Braunschweig, 38106 Braunschweig, Hans-Sommer-Str. 10
N2O is a widely used precursor molecule for O(1D) atoms, in particular for investigating the bimolecular reaction O(1D) + N2O → 2 NO which can be initiated with relative experimental ease by 193 nm laser radiation in a N2O sample. More often than not, such experiments are performed in supersonic expansions where low temperature and high number density favour the formation of N2O clusters which might affect the course of the reaction. Therefore, a method for characterization of the N2O sample under the conditions of a reactive scattering experiment is desirable.
State selective excitation and detection of of N2O through its Rydberg states is possible by resonance enhanced multi-photon ionization (REMPI) spectroscopy. Only two such studies have been published up to date, mainly relying on a (3+1)-REMPI scheme in the wavelength range from 350 nm to 370 nm. Data on (2+1)-REMPI excitation are less abundant and exist only for selected wavelength ranges and temperatures. Cluster formation has neither been investigated nor investigated.
The aim of the presented work is to characterize (2+1)-REMPI spectroscopy of N2O in the wavelength range from 235 nm to 245 nm under different experimental conditions, i.e. for room temperature and jet-cooled samples, and to explore the possibility of cluster detection.