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http://hdl.handle.net/2445/178863
Title: | Ultrafast relaxation of photoexcited superfluid He nanodroplets |
Author: | 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, O. Prince, K.C. Richter, R. Ziemkiewicz, M.P. Möller, T. Eloranta, J. Pi Pericay, Martí Barranco Gómez, Manuel Stienkemeier, F. |
Keywords: | Nanotecnologia Nanotechnology |
Issue Date: | 8-Jan-2020 |
Publisher: | Nature Publishing Group |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1038/s41467-019-13681-6 |
It is part of: | Nature Communications, 2020, vol. 11, num. 112 |
URI: | http://hdl.handle.net/2445/178863 |
Related resource: | https://doi.org/10.1038/s41467-019-13681-6 |
ISSN: | 2041-1723 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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