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A: Fachverband Atomphysik
A 25: Poster – Cluster and Nanoparticles (joint session MO/A)
A 25.8: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG
High-Resolution Electron Spectroscopy of Doped Helium Nanodroplets with a Hemispherical Electron Analyzer — •Narcis-Silviu Blaj1, Niklas Scheel2, Rajni Rajni1, Asbjørn Laegdsmand1, Aleksandar Milosavljevic3, John Bozek3, and Marcel Mudrich1,2 — 1Institute of Physics, University of Kassel, D-34132 Kassel, Germany — 2Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark — 3Soleil Synchrotron, 91190 Saint-Aubin, France
Helium nanodroplets (HNDs) have mostly been used as inert cryo-matrices for spectroscopy of embedded molecules and clusters.
We performed the first high-resolution X-ray photoelectron spectroscopy (XPS) measurements of pure and doped helium nanodroplets at the PLEIADES beamline of SOLEIL Synchrotron using a hemispherical electron analyzer (HEA). In particular, we explored droplets doped with krypton and argon. The formation of Ar and Kr clusters was identified through the appearance of additional low-binding-energy features accompanying the spin-orbit doublets of the atomic photolines (Kr 3d and Ar 2p), in agreement with earlier observations of photoemission from pure small Kr and Ar clusters. We systematically recorded XPS spectra as a function of photon energy, droplet size, and doping level, allowing us to study the evolution of spectral line shifts and intensity ratios between atomic and cluster-specific components.
In addition, we plan further experiments at SOLEIL as well as at other synchrotron facilities to explore a wider range of photon energies, dopants, and cluster conditions.
Keywords: Helium nanodroplets (HNDs); X-ray Photoelectron Spectroscopy (XPS); Hemispherical Electron Analyzer (HEA); Synchrotron Radiation Experiments; Cluster Formation in Quantum Superfluids