Arne Morlok

Coherent multidimensional specroscopy of ultrafast molecular processes

Two-dimensional coherent electronic spectroscopy (2DES) is a powerful method to study the ultrafast dynamics of matter [1]. This includes processes like singlet fission as well as charge and energy transfer, which play a crucial role in many technical applications such as solar cells [2]. Singlet fission in particular, has gained increasing attention during the last two decades as a way to improve solar cell efficiency with organic molecules beyond the Shockley-Queisser limit [3,4].

In our group, we isolate the functional molecular units in cold nobel gas clusters in the gas phase and apply 2DES to study the ultrafast dynamics [5]. This allows us to study the molecular processes of interest in an almost completely unperturbed environment. To obtain a wide view on the investigated systems we employ different detection methods, ranging from fluorescence, electron energy and photoion mass detection [6].

 [1] L. Bruder, U. Bangert, M. Binz, D. Uhl, and F. Stienkemeier, J. Phys. B: At. Mol. Opt. Phys. 52, 183501 (2019)

[2] V. Coropceanu, X. Chen, T. Wang, Z. Zheng, J. Brédas, Nat. Rev. Mater. 4, 689 (2019)

[3] W. Shockley and H. Queisser, Int. J. Appl. Phys. 32, 510 (1961)

[4] M. Einzinger et al., Nature 571, 90 (2019)

[5] L. Bruder et al., Nat Commun 9, 4823 (2018).

[6] L. Bruder et al., J. Phys. B: At. Mol. Opt. Phys. 52, 183501 (2019)

Supervisor: Frank Stienkemeier