Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Poster 2

MO 15.19: Poster

Wednesday, March 16, 2022, 16:30–18:30, P

Development of a glass based supersonic molecular beam source for organic molecules — •Brendan Wouterlood, Sebastian Hartweg, Lukas Bruder, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

Two-dimensional electronic spectroscopy (2DES) is a powerful spectroscopic tool which allows for the probing of atomic and molecular dynamics on ultra-fast timescales [1]. Application of this spectroscopic technique to polycyclic aromatic hydrocarbons (PAHs), such as acenes and porphyrins, promises a detailed understanding of their electronic structure and excited state dynamics. These electronic properties make some of these molecules interesting candidates for application in organic photovoltaics and motivate much past and present research [2]. One challenge of these studies has been the generation of high gas-phase target densities of these molecules due to their low vapour pressure and thermal decomposition by excessive heating.

In order to provide large target densities, since these molecules have relatively low vapour pressures, the supersonic nozzle will need to be heated to around 500°C. A quartz glass nozzle system will thus be developed in order to allow us to heat the molecules to these high temperatures while minimising the risk of thermal decomposition of the sample that can be catalysed by hot metal surfaces. We will present the nozzle design and initial characterisation results.

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

[2] O. Ostroverkhova, Chemical Reviews 116 (22), 13279-13412 (2016).