Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 30: Molecular Spectroscopy and Theoretical Approaches
MO 30.3: Vortrag
Freitag, 14. März 2025, 15:00–15:15, HS XVI
Spatially resolved spectroscopy of Rydberg states in nitric oxide — •Yannick Schellander1, Fabian Munkes2, Alexander Trachtmann2, Florian Anschutz2, Ettore Eder2, Hanna Lippmann2, Meriem Mavlutova2, Marius Winter1, Robert Löw2, Patrick Schalberger1, Tilmann Pfau2, Harald Kübler2, and Norbert Fruehauf1 — 1Institute for Large Area, University of Stuttgart, Stuttgart, Germany — 25th Institute of Physics, University of Stuttgart, Germany
High-resolution continuous-wave (cw) laser spectroscopy of nitric oxide (NO) molecules has been performed to study the energy-level structure. Special focus is on effects of electric fields on high Rydberg states. The photo-excitation is based on a resonance enhanced three-color three-photon excitation scheme. In contrast to theory, the measurements show states with no frequency shift. The reason for this effect is most likely an inhomogeneous electric field distribution. This is caused by field attenuations near the cell walls resulting from charge carrier accumulations on these. Therefore, charge carriers generated near the cell walls experience a much lower electric field than expected. To further investigate the charge carrier effects and prove the given explanation, spatially resolved measurements of the ionization currents are performed. These kinds of measurements are enabled by an electrode / transimpedance amplifier array based on thin-film technology. Other thinkable applications of such a sensor array could be the determination of the dynamic density distribution by turbulent gas flow or in resonance-enhanced multiphoton ionization experiments.
Keywords: High-resolution laser spectroscopy; Ionization current detection; Nitrix oxide; Spatially resolved sensing