Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 1: Ultrafast Spectroscopy

MO 13.1: Poster

Dienstag, 6. März 2018, 16:15–18:15, Orangerie

Multidimensional electronic spectroscopy with mass-resolved ion detection — •Hans-Peter Solowan, Tristan Ford, Sebastian Roeding, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

We report a new technique, molecular-beam coherent two-dimensional (2D) electronic spectroscopy, enabling multidimensional electronic spectroscopy of gas-phase samples with mass-resolved ion detection. Using time-of-flight mass spectrometry, we have introduced cations as a new observable in coherent 2D spectroscopy.

Using a pulse shaper based on an acousto-optic programmable dispersive filter and rapid scanning [1] we focus a train of four collinear pulses in the visible regime into an interaction region with a molecular beam. Via phase cycling [2] the signals of the time-of-flight mass spectrometer can be disentangled to extract the different contributions, like the photon-echo response. With this new experimental method, the ionization pathway of nitrogen dioxide is investigated and the first ion-selective 2D spectrum of a molecular-beam sample is aquired. By implementation of a supersonic molecular beam with argon as a seed gas, the range of potential samples will be extended.

[1] S. Draeger, S. Roeding, and T. Brixner, Opt. Express 25, 3259 (2017)

[2] H.-S. Tan, J. Chem. Phys. 129, 124501 (2008).