Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 9: Femtosecond Spectroscopy I

MO 9.8: Talk

Wednesday, March 11, 2020, 12:45–13:00, f102

Revealing delocalized states using multiple-quantum two-dimensional spectroscopy — •Friedemann Landmesser, Lukas Bruder, Ulrich Bangert, Marcel Binz, Elena Leißler, Daniel Uhl, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany

Many-body quantum states are considered to play a crucial role in atomic and molecular systems with respect to dissipation, excitation, and energy transfer (cf. [1]). We aim at investigating collective effects by multiple-quantum coherence experiments, where multiphoton processes can be separated from one-photon transitions [2] and delocalized excitons can be probed with extraordinary sensitivity [3]. We now extend our detection scheme to phase-modulated multiple-quantum two-dimensional coherent spectroscopy [4]. Our focus will lie on the investigation of dilute alkali atom vapors, where we observe dipolar couplings at extremely low densities [3], as well as molecular networks formed on cold rare gas clusters. In the latter system, we previously observed intriguing cooperative processes such as superradiance and singlet fission [5].

[1] F. Fassioli et al., J. Royal Soc. Interface 11, 20130901 (2014).

[2] L. Bruder et al., Phys. Rev. A 92, 053412 (2015).

[3] L. Bruder et al., Phys. Chem. Chem. Phys. 21, 2276 (2019).

[4] S. Yu et al., Opt. Lett. 44, 2795 (2019).

[5] S. Izadnia et al., J. Phys. Chem. Lett. 8, 2068 (2017).