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MO: Fachverband Molekülphysik

MO 15: Rotational- and Vibrational-resolution Spectroscopy

MO 15.7: Talk

Thursday, March 9, 2023, 12:45–13:00, F142

2DIR Spectroscopy of an Organic Azide Model — •Claudia Gräve, Jörg Lindner, and Peter Vöhringer — Clausius-Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany

The photoinduced dynamics of azides is of great importance in organic chemistry but not yet understood, even at a qualitative level. We are currently utilizing ultrafast spectroscopy to address these dynamics.

Here, we report on first results from femtosecond two-dimensional infrared (2DIR) spectroscopy of 1-cyano-2-(4-azidophenyl)-acetylene to understand vibrational energy transfer (VET) to the solvent and intramolecular vibrational energy redistribution (IVR). Our 2DIR data show that IVR from the azide moiety through the phenyl ring onto the para-positioned cyano-acetylene group occurs on a time scale of 3.5 ps. In contrast, VET in chloroform solution requires 20 ps. Finally, a coherent vibrational quantum beat can be detected, which dephases within roughly 1 ps.