München 2004 – scientific programme

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MO: Molekülphysik

MO 12: Poster I

MO 12.17: Poster

Tuesday, March 23, 2004, 14:00–16:00, Schellingstr. 3

Unimolecular fragmentation of anthracene and phenanthrene — •Adalbert Ding, Christian Lenski, and Michael Lenski — Technische Universität Berlin, Optisches Institut, Sekr. P1–1, Strasse des 17. Juni 135, D–10623 Berlin

Most favoured theories concerning the diffuse interstellar bands propose that the observed radiation originates from infrared fluorescences of vibronic highly excited polycyclic aromatic hydrocarbons. In the present study light from the Berlin synchrotron BESSY was used to investigate the fragmentation of anthracene and phenanthrene.

By evaporation of the solid substances in an oven an effusive beam of target molecules was produced. After having been ionized using photon energies between 10 eV and 30 eV the fragmentation of these substances was analysed by means of time–of–flight–mass–spectrometry.

Comparison of experimental results with RRKM–calculations serves to clarify if anthracene and phenanthrene isomerize to identical intermediate states prior to fragmentation.