Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics

MO 11.8: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Multimodal Time-Resolved Spectroscopy: Combining Transient Absorption and Fifth-order Spectroscopies — •Takeshi Miki, Marcus Motzkus, and Tiago Buckup — Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany

Ultrafast spectroscopy is able to address many different molecular degrees of freedom by applying several kinds of time-resolved spectroscopic methods (TRSM). In spite of the success of each TRSM to unravel specific parts of the molecular dynamics (intra- and intermolecular, electronic or structural), the long-standing goal of correlating such aspects with each other, and, therefore, combining them under one general molecular model is still a major challenge in spectroscopy. In this work we demonstrate the advantages of performing several time-resolved techniques like transient absorption and pump-DFWM (transient grating and photon echo) in one single experimental setup under similar experimental parameters. We develop a fitting a model and show for two prototype organic molecules in solution how transient absorption data can be combined with time-resolved vibrational pump-transient grating and pump-photon echo. Such a multimodal time resolved spectroscopy allows for unambiguously determination of the amplitude and phase of all major oscillatory contributions due to intra- as well as intermolecular dynamics, in spite of the background-free (homodyne) detection geometry.