Fano Resonances observed in Helium Nanodroplets
A. C. LaForge, D. Regina, G. Jabbari, K. Gokhberg, N. V. Kryzhevoi, S., R. Krishnan, M. Hess, P. O'Keeffe, A. Ciavardini, K. C. Prince, R. Richter,, R. Moshammer, L. S. Cederbaum, T. Pfeifer, F. Stienkemeier, and M. Mudrich
TL;DR
This study investigates Fano resonances in doubly-excited helium nanodroplets using synchrotron radiation, revealing size-dependent broadening, energy shifts, and novel resonances not present in atomic systems.
Contribution
It provides new insights into the complex resonance behavior of helium nanodroplets, highlighting differences from atomic helium and the effects of droplet environment.
Findings
Broader resonance lines compared to atomic helium
Energy shifts increase with higher excited states
Observation of additional resonances not seen in atomic systems
Abstract
Doubly-excited Rydberg states of helium (He) nanodroplets have been studied using synchrotron radiation. We observed Fano resonances related to the atomic N = 2,0 series as a function of droplet size. Although similar qualitatively to their atomic counterparts, the resonance lines are broader and exhibit a shift in energy which increases for the higher excited states. Furthermore, additional resonances are observed which are not seen in atomic systems. We discuss these features in terms of delocalized atomic states perturbed by the surrounding He atoms and compare to singly excited droplets.
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