Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: Electronic Spectroscopy 2
MO 20.1: Talk
Thursday, March 20, 2014, 16:30–16:45, BEBEL SR144
Electronic Spectroscopy of 1-Phenylethynyl-Naphthalene — •Philipp Constantinidis1, Melanie Lang1, Jörg Herterich1, Ingo Fischer1, Johannes Auerswald2, and Anke Krueger2 — 1Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
A recent IR/UV double resonance study identified 1-phenylethynyl-naphthalene (1-PEN) as the major dimerization product of phenylpropargyl radicals. Considering the importance of C3 hydrocarbons in the initial phase of the formation of polycyclic aromatic hydrocarbons (PAHs) in combustion processes, both the phenylpropargyl radical as C9 unit and its stable dimer 1-PEN could also play a conceivable role in PAH growth [1].
We investigated the S1 excited state of 1-PEN by means of [1+1]-REMPI spectroscopy. A rich structure of low wavenumber bands was observed, which could be assigned to the torsional motion. Vibrational frequencies of 6 cm-1 and 17 cm-1 respectively were derived for the torsional mode in the ground and excited state. Spectra of the 1-PEN/Ar cluster exhibit a red shift of the origin of 22 cm-1, comparable to argon clusters of other aromatic molecules.
[1] K. H. Fischer, J. Herterich, I. Fischer, S. Jaeqx and A. M. Rijs, J. Phys. Chem. A 116, 8515 (2012)