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Nature Research, Scientific Reports, 1(4), 2014

DOI: 10.1038/srep03621

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Collective Autoionization in Multiply-Excited Systems: A novel ionization process observed in Helium Nanodroplets

Journal article published in 2014 by A. C. Laforge, M. Drabbels, N. B. Brauer, M. Coreno, M. Devetta, M. Di Fraia, P. Finetti, C. Grazioli ORCID, R. Katzy, V. Lyamayev, T. Mazza, M. Mudrich ORCID, P. O'Keeffe, P. OKeeffe, Y. Ovcharenko and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractFree electron lasers (FELs) offer the unprecedented capability to study reaction dynamics and image the structure of complex systems. When multiple photons are absorbed in complex systems, a plasma-like state is formed where many atoms are ionized on a femtosecond timescale. If multiphoton absorption is resonantly-enhanced, the system becomes electronically-excited prior to plasma formation, with subsequent decay paths which have been scarcely investigated to date. Here, we show using helium nanodroplets as an example that these systems can decay by a new type of process, named collective autoionization. In addition, we show that this process is surprisingly efficient, leading to ion abundances much greater than that of direct single-photon ionization. This novel collective ionization process is expected to be important in many other complex systems, e.g. macromolecules and nanoparticles, exposed to high intensity radiation fields.