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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/178863
Ultrafast relaxation of photoexcited superfluid He nanodroplets
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The relaxation of photoexcited nanosystems is a fundamental process of light-matter interaction. Depending on the couplings of the internal degrees of freedom, relaxation can be ultrafast, converting electronic energy in a few fs, or slow, if the energy is trapped in a metastable state that decouples from its environment. Here, we study helium nanodroplets excited resonantly by femtosecond extreme-ultraviolet (XUV) pulses from a seeded free- electron laser. Despite their superfluid nature, we find that helium nanodroplets in the lowest electronically excited states undergo ultrafast relaxation. By comparing experimental pho- toelectron spectra with time-dependent density functional theory simulations, we unravel the full relaxation pathway: Following an ultrafast interband transition, a void nanometer-sized bubble forms around the localized excitation (He ) within 1 ps. Subsequently, the bubble collapses and releases metastable He at the droplet surface. This study highlights the high level of detail achievable in probing the photodynamics of nanosystems using tunable XUV pulses.
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MUDRICH, M., LAFORGE, A.c., CIAVARDINI, A., O'KEEFFE, P., CALLEGARI, C., CORENO, M., DEMIDOVICH, A., DEVETTA, M., DI FRAIA, M., DRABBELS, M., FINETTI, P., GESSNER, O., GRAZIOLI, C., HERNANDO, A., NEUMARK, D.m., OVCHARENKO, Y., PISERI, P., PLEKAN, Oksana, PRINCE, Kevin c., RICHTER, R., ZIEMKIEWICZ, M.p., MÖLLER, T., ELORANTA, J., PI PERICAY, Martí, BARRANCO GÓMEZ, Manuel, STIENKEMEIER, F.. Ultrafast relaxation of photoexcited superfluid He nanodroplets. _Nature Communications_. 2020. Vol. 11, núm. 112. [consulta: 24 de gener de 2026]. ISSN: 2041-1723. [Disponible a: https://hdl.handle.net/2445/178863]