Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.9: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Transient coupling spectroscopy and control of electronic states in the liquid phase — •Kristina Meyer¹, Rima Schüssler¹, Christian Ott¹, Philipp Raith¹, Andreas Kaldun¹, Martin Laux¹, Thomas Ding¹, Zuoye Liu¹, Yizhu Zhang², and Thomas Pfeifer¹ — ¹Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ²Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

Recently, pump--probe experiments on helium atoms using infrared (IR) and attosecond pulses were performed [1]. There, the presence of a laser field shifts the phase of the metastable excited states and modifies the natural Fano absorption line shapes. Here, we study this phenomenon for larger molecules in the liquid phase, in particular a solution of the dye IR144 in methanol, using a compact transient-absorption setup. Modifications of absorption line shapes at delay times where the probe pulse precedes the pump pulse are observed, which are a first indication of excited-state dressing effects as observed before with attosecond pulses in helium. The same experimental setup has recently been proven to work also for 2D spectroscopy measurements [2]. A combination with a pulse shaper will soon allow the control of electronic states in complex molecules. The pulse shaper can also be used to increase the temporal resolution [3] and/or improve the system's excitation transfer response [4] in the future.

[1] C. Ott et al., arXiv: 1205.0519v1, [2] Y. Zhang et al., submitted,

[3] K. Meyer et al., PRL 108, 098302 (2012), [4] A. W. Chin et al., NJP 12, 065002 (2010),