Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 4: Molecular Spectroscopy of Liquid Jets I
MO 4.3: Vortrag
Montag, 10. März 2025, 17:30–17:45, HS XVI
Delocalized electrons in aqueous jets — •Fabio Novelli1, Adrian Buchmann1, Iqra Yousaf1, Lion-Luca Stiewe1, Wibke Bronsch2, Federico Cilento2, Claudius Hoberg1, and Martina Havenith1 — 1Ruhr University Bochum, Bochum, Germany — 2Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, Trieste I-34149, Italy
The photoexcitation of iodide solutions serves as a model for generating electrons in liquid water. We used transient absorption spectroscopy across terahertz, near-infrared, and visible frequencies on a 10-micron thick liquid jet operating at normal temperature and pressure conditions (20 C, 1 atm). We demonstrate that the two-photon absorption of 400 nm pulses can impulsively generate short-lived (250 fs) electrons that are delocalized tens of angstroms away from the parent anion. These electron states are associated with 5p-6p transitions, similar to frustrated excitons with a large radius. Our transient terahertz spectroscopy findings reveal that delocalized electrons exhibit an electronic mobility of 1 cm2/(Vs). This is significantly higher, by approximately 500 times, than that of fully relaxed or hydrated electrons, and roughly comparable to that found in amorphous silicon or conductive conjugated polymers. This work highlights the effectiveness of transient terahertz spectroscopy in investigating low-energy, intra-band electronic transitions in soft condensed matter systems and can assist in the development of liquid-based optoelectronic devices.
Keywords: terahertz; liquid; water; electron; mobility