Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Femtosecond Spectroscopy 2
MO 7.3: Vortrag
Dienstag, 1. März 2016, 11:45–12:00, f102
A ps time-resolved study of NI, Me-NI and NDCA — •Hans-Christian Schmitt, Thiemo Gerbich, Ingo Fischer, Jens Petersen, and Roland Mitric — Insitute for Physical and Theoretical Chemistry, University of Würzburg, Germany
In a molecular beam experiment we investigated the excited state dynamics of isolated Naphthalimide (NI), N-Methyl-Naphthalimide (Me-NI) and 1,8-Naphthalic anhydride (NDCA).
Our ps-laser system allowed us to probe different vibronic states with a resolution of 20 cm−1. Hereby we found an interesting dependence of the decay time from the excitation energy. In NDCA the lifetime drops from 1.2 ns at the origin of the S1 to 30 ps at an excess energy of 800 cm−1. In NI and Me-NI the lifetimes are nearly constant at around 10-17 ps. The experiments were accompanied by surface hopping dynamics simulations that give detailed insights into the occuring photochemical processes. These are a fast internal conversion via a conical intersection and intersystem crossing which compete as deacitivation processes.