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P: Plasmaphysik

P 8: Magnetic Confinement and Plasma Technology (Poster Session)

P 8.24: Poster

Montag, 2. April 2001, 12:30–15:00, AT2

Diagnosis of a benzene discharge with a mass-selective spectroscopic technique — •Felix Güthe, Thomas Pino, Hongbin Ding, and John P. Maier — Institute for Physical Chemistry, University of Basel,Klingelbergstrasse 80, CH-4056 Basel, Switzerland

The products formed in a benzene discharge have been probed by resonant two photon ionisation spectroscopy. The molecules formed are cooled in a supersonic expansion and mass-analysis combined with spectroscopic information is used to identify the species. By this means styrene, phenylacetylene, methylstyrene, indene, fluorene and tolane are recognized. No 6-ring polycyclic aromatic hydrocarbon could be detected. With this method the plasma is sampled at an early stage where the ethynylated and cyclopentafused polycyclic aromatic hydrocarbons are more abundant than the more stable 6-ring ones. The coupling of a discharge source to a REMPI detection system enables electronic spectra of neutral molecules to be to obtained which can be used to study their role in combustion processes, plasmas as well as in astrophysics.