Speaker
Roman Messner
(Institute of Experimental Physics, Graz University of Technology)
Description
We explore the evolution of the electronic spectrum of potassium compounds isolated in helium droplets from single atoms and molecules up to nanosized clusters, using a novel combination of experimental methods. The employment of a time of flight mass spectrometer enables the spectroscopy of atomically precise potassium clusters up to K110. Spectra for larger clusters within a selected size range are also recorded, revealing insight into the properties and growth of potassium nanoparticles in helium droplets. While small molecules exhibit multiple distinct spectral features, a collective resonance emerges at about 640 nm in the spectra of larger clusters. With increasing cluster size, the resonance continuously shifts towards the blue.
Primary authors
Roman Messner
(Institute of Experimental Physics, Graz University of Technology)
Robert di Vora
(Institute of Experimental Physics, Graz University of Technology)
Prof.
Wolfgang E. Ernst
(Institute of Experimental Physics, Graz University of Technology)
Dr
Florian Lackner
(Institute of Experimental Physics, Graz University of Technology)
