Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 8: Electronic Spectroscopy 1

MO 8.6: Talk

Tuesday, March 18, 2014, 15:30–15:45, BEBEL HS213

Dissociative photoionization of 1,4-di-tert-butyl-1,4-azaborine — •Fabian Holzmeier¹, Melanie Lang¹, Patrick Hemberger², and Ingo Fischer¹ — ¹Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland Süd, 97074 Würzburg, Deutschland — ²Swiss Light Source, Paul-Scherrer-Institut, 5232 Villigen PSI, Schweiz

Boron containing organic molecules play an important role for applications in optoelectronics and biomedicine. By synthesizing a 1,4-azaborine derivative, 1,4-di-tert-butyl-1,4-azaborine, inorganic chemists have found a synthetic route for an interesting, novel class of molecules. In an iPEPICO-experiment (imaging Photoelectron Photoion Coincidence) at the Swiss Light Source the photoionization of 1,4-di-tert-butyl-1,4-azaborine was investigated using VUV synchrotron radiation. The ionization energy of this molecule could be determined by threshold photoelectron spectroscopy, as well as the energetics of excited states in the cation. In addition, dissociative photoionization (DPI) was observed at higher photon energies. Several parallel and sequential dissociation channels were identified. The appearance energies of the fragment ions yield information on the chemical bonding. Using a RRKM rate theory approach the experimental data on the DPI to the three most important channels was modeled and accurate appearance energies were determined.