The image depicts the "liquid jet" [1] the Havenith Group at Ruhr-University Bochum has engineered specifically for employing optical pump THz probe spectroscopy on water. This setup involves a thin stream of water stimulated by a blue laser. The response of the water is then observed with THz radiation. The image captures the "water jet" upon interaction with the blue laser beam.
Several research papers have resulted from this experimental setup:
F. Novelli, K. Chen, A. Buchmann, T. Ockelmann, C. Hoberg, T. Head-Gordon, M. Havenith
The birth and evolution of solvated electrons in the water, PNAS (2023), 120 , e2216480120, DOI:10.1073/pnas.2216480120
T. Ockelmann, C. Hoberg, A. Buchmann, F. Novelli, M. Havenith
Energy Dissipation into the Solvent during Proton Transfer Occurs via Acoustic Phonons, J. Phys. Chem. B (2023), 127, 44, 9560–9565, DOI: 10.1021/acs.jpcb.3c04874
A. Buchmann, C.Hoberg, F. Novelli
An ultra-fast liquid switch for terahertz radiation, APL Photonics 7 (2022), 121302 , DOI: 10.1063/5.013023