Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy

MO 5.16: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Perturbed Polarization Decay and Line-Shape Modifications in Liquids — •Kristina Meyer, Zuoye Liu, Andreas Ludwig, Christian Ott, Andreas Kaldun, Martin Laux, Thomas Ding, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Recent time-resolved absorption experiments in helium allowed the transformation of Fano to Lorentzian line shapes via laser control of the optical dipole response caused by phase changes in doubly-excited states [1,2]. Here, we study a generalization of this mechanism to more complex systems such as molecules in the liquid phase. We perform transient-absorption measurements in a solution of the dye IR144 in methanol using few-cycle, 7-fs NIR laser pulses in a compact, high-stability time-resolved spectroscopy setup [3]. Modifications of the absorption profiles can be observed as a function of the coupling laser intensity. In addition, a pulse shaper has been set up in combination with the multiphoton intrapulse interference phase scan method (MIIPS) [4]. This provides the opportunity to characterize and control the shape of the interacting laser pulses and to explore the control of electronic states and their couplings by observing pulse-shape dependent line shapes in the future.

[1] C. Ott et al., arXiv:1205.0519 (2012)

[2] C. Ott et al., Science 340, 716 (2013)

[3] Y. Zhang, K. Meyer, C. Ott, and T. Pfeifer, Opt. Lett. 38, 356 (2013)

[4] B. Xu et al., J. Opt. Soc. Am. B 23, 750 (2006)