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- ItemRoadmap on photonic, electronic and atomic collision physics: I. Light-matter interaction(Bristol : IOP Publ., 2019) Ueda, Kiyoshi; Sokell, Emma; Schippers, Stefan; Aumayr, Friedrich; Sadeghpour, Hossein; Burgdörfer, Joachim; Lemell, Christoph; Tong, Xiao-Min; Pfeifer, Thomas; Calegari, Francesca; Palacios, Alicia; Martin, Fernando; Corkum, Paul; Sansone, Giuseppe; Gryzlova, Elena V.; Grum-Grzhimailo, Alexei N.; Piancastelli, Maria Novella; Weber, Peter M.; Steinle, Tobias; Amini, Kasra; Biegert, Jens; Berrah, Nora; Kukk, Edwin; Santra, Robin; Müller, Alfred; Dowek, Danielle; Lucchese, Robert R.; McCurdy, C. William; Bolognesi, Paola; Avaldi, Lorenzo; Jahnke, Till; Schöffler, Markus S.; Dörner, Reinhard; Mairesse, Yann; Nahon, Laurent; Smirnova, Olga; Schlathölter, Thomas; Campbell, Eleanor E.B.; Rost, Jan-Michael; Meyer, Michael; Tanaka, Kazuo A.We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of the ICPEAC conference. In Roadmap I, we focus on the light-matter interaction. In this area, studies of ultrafast electronic and molecular dynamics have been rapidly growing, with the advent of new light sources such as attosecond lasers and x-ray free electron lasers. In parallel, experiments with established synchrotron radiation sources and femtosecond lasers using cutting-edge detection schemes are revealing new scientific insights that have never been exploited. Relevant theories are also being rapidly developed. Target samples for photon-impact experiments are expanding from atoms and small molecules to complex systems such as biomolecules, fullerene, clusters and solids. This Roadmap aims to look back along the road, explaining the development of these fields, and look forward, collecting contributions from twenty leading groups from the field. © 2019 IOP Publishing Ltd.
- ItemPublisher Correction: Coherent diffractive imaging of single helium nanodroplets with a high harmonic generation source (Nature communications (2017) 8 1 (493))([London] : Nature Publishing Group UK, 2018) Rupp, Daniela; Monserud, Nils; Langbehn, Bruno; Sauppe, Mario; Zimmermann, Julian; Ovcharenko, Yevheniy; Möller, Thomas; Frassetto, Fabio; Poletto, Luca; Trabattoni, Andrea; Calegari, Francesca; Nisoli, Mauro; Sander, Katharina; Peltz, Christian; Vrakking, Marc J.; Fennel, Thomas; Rouzée, ArnaudIn the original version of this Article, the affiliation for Luca Poletto was incorrectly given as 'European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Hamburg, Germany', instead of the correct 'CNR, Istituto di Fotonica e Nanotecnologie Padova, Via Trasea 7, 35131 Padova, Italy'. This has now been corrected in both the PDF and HTML versions of the Article.
- ItemApplication of Matched-Filter Concepts to Unbiased Selection of Data in Pump-Probe Experiments with Free Electron Lasers(Basel : MDPI, 2017-06-16) Callegari, Carlo; Takanashi, Tsukasa; Fukuzawa, Hironobu; Motomura, Koji; Iablonskyi, Denys; Kumagai, Yoshiaki; Mondal, Subhendu; Tachibana, Tetsuya; Nagaya, Kiyonobu; Nishiyama, Toshiyuki; Matsunami, Kenji; Johnsson, Per; Piseri, Paolo; Sansone, Giuseppe; Dubrouil, Antoine; Reduzzi, Maurizio; Carpeggiani, Paolo; Vozzi, Caterina; Devetta, Michele; Faccialà, Davide; Calegari, Francesca; Castrovilli, Mattea; Coreno, Marcello; Alagia, Michele; Schütte, Bernd; Berrah, Nora; Plekan, Oksana; Finetti, Paola; Ferrari, Eugenio; Prince, Kevin; Ueda, KiyoshiPump-probe experiments are commonly used at Free Electron Lasers (FEL) to elucidate the femtosecond dynamics of atoms, molecules, clusters, liquids and solids. Maximizing the signal-to-noise ratio of the measurements is often a primary need of the experiment, and the aggregation of repeated, rapid, scans of the pump-probe delay is preferable to a single long-lasting scan. The limited availability of beamtime makes it impractical to repeat measurements indiscriminately, and the large, rapid flow of single-shot data that need to be processed and aggregated into a dataset, makes it difficult to assess the quality of a measurement in real time. In post-analysis it is then necessary to devise unbiased criteria to select or reject datasets, and to assign the weight with which they enter the analysis. One such case was the measurement of the lifetime of Intermolecular Coulombic Decay in the weakly-bound neon dimer. We report on the method we used to accomplish this goal for the pump-probe delay scans that constitute the core of the measurement; namely we report on the use of simple auto- and cross-correlation techniques based on the general concept of “matched filter”. We are able to unambiguously assess the signal-to-noise ratio (SNR) of each scan, which then becomes the weight with which a scan enters the average of multiple scans. We also observe a clear gap in the values of SNR, and we discard all the scans below a SNR of 0.45. We are able to generate an average delay scan profile, suitable for further analysis: in our previous work we used it for comparison with theory. Here we argue that the method is sufficiently simple and devoid of human action to be applicable not only in post-analysis, but also for the real-time assessment of the quality of a dataset.
- ItemCoherent diffractive imaging of single helium nanodroplets with a high harmonic generation source([London] : Nature Publishing Group UK, 2017) Rupp, Daniela; Monserud, Nils; Langbehn, Bruno; Sauppe, Mario; Zimmermann, Julian; Ovcharenko, Yevheniy; Möller, Thomas; Frassetto, Fabio; Poletto, Luca; Trabattoni, Andrea; Calegari, Francesca; Nisoli, Mauro; Sander, Katharina; Peltz, Christian; J. Vrakking, Marc; Fennel, Thomas; Rouzée, ArnaudCoherent diffractive imaging of individual free nanoparticles has opened routes for the in situ analysis of their transient structural, optical, and electronic properties. So far, single-shot single-particle diffraction was assumed to be feasible only at extreme ultraviolet and X-ray free-electron lasers, restricting this research field to large-scale facilities. Here we demonstrate single-shot imaging of isolated helium nanodroplets using extreme ultraviolet pulses from a femtosecond-laser-driven high harmonic source. We obtain bright wide-Angle scattering patterns, that allow us to uniquely identify hitherto unresolved prolate shapes of superfluid helium droplets. Our results mark the advent of single-shot gas-phase nanoscopy with lab-based short-wavelength pulses and pave the way to ultrafast coherent diffractive imaging with phase-controlled multicolor fields and attosecond pulses.