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MO: Molekülphysik

MO 8: Posters Thursday: Dissociation and other Collision Processes

MO 8.12: Poster

Donnerstag, 5. April 2001, 12:30–15:00, AT3

Unimolecular fragmentation of anthracene and phenanthrene — •Adalbert Ding¹, Christian Lenski¹, Michael Lenski¹, and Chava Lifshitz² — ¹Institute for Optics, Technical University of Berlin, Germany — ²Dept. of Chemistry, The Hebrew University, Jerusalem, Israel

Light from the Berlin synchrotron BESSY was used to investigate the fragmentation of anthracene and phenanthrene. Both substances were ionized using photon energies between 10 eV and 30 eV and analysed in a McLaren-type time off flight mass spectrometer. At sufficiently high photon energies anthracene and phenantrene fragment dissociate splitting off H-atoms and C_xH_y–fragments. The critical energies for dissociating H-atoms are in good agreement with the appropriate values from electron bombardement ionisation. The fragmentation behaviour of anthracene and phenantrene and a comparison with experimantally taken break-down curves indicate a fast isomerisation process.