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MON: Monday Contributed Sessions

MON 16: Quantum Spectroscopy

MON 16.1: Talk

Monday, September 8, 2025, 16:30–16:45, ZHG004

Two-photon excitation spectroscopy of high pressure xenon- noble gas mixtures — •Eric Boltersdorf, Thilo vom Hövel, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik, Bonn, Deutschland

When confined to a dye-filled optical microcavity, photons can exhibit Bose-Einstein condensation upon thermalization after repeated absorption and (re-)emission processes on the dye molecules. This has been experimentally demonstrated first in 2010.
In this work, an experimental approach is investigated to realize a Bose-Einstein condensate of vacuum-ultraviolet photons (100nm - 200nm) by absorption and (re-)emission cycles between xenon’s 5p⁶ and 5p⁵6s (J = 1) state in dense xenon-noble gaseous ensembles. Here, we show the results of two-photon excitation spectroscopy to higher lying electronic states. We report on excitation spectra with excitation wavelengths ranging from 220nm to 260nm. The collected emission around 147nm is attributed to the decay of the 5p⁵6s (J = 1) state which is proposedly populated via collisional deactivation from the higher lying excited states. We show data for xenon-krypton as well as for xenon-helium mixtures.

Keywords: Bose-Einstein Condensation; Spectroscopy; High Pressure; Vacuum-Ultraviolet; Two-Photon Excitation