Mettin, Robert

[["dc.bibliographiccitation.firstpage","273"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nonlinear Dynamics"],["dc.bibliographiccitation.lastpage","293"],["dc.bibliographiccitation.volume","94"],["dc.contributor.author","Hegedűs, Ferenc"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Parlitz, Ulrich"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2020-12-10T14:11:45Z"],["dc.date.available","2020-12-10T14:11:45Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1007/s11071-018-4358-z"],["dc.identifier.eissn","1573-269X"],["dc.identifier.issn","0924-090X"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15562"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71189"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Non-feedback technique to directly control multistability in nonlinear oscillators by dual-frequency driving"],["dc.title.alternative","GPU accelerated topological analysis of a bubble in water"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","3468"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Vaßholz, Malte"],["dc.contributor.author","Hoeppe, H. P."],["dc.contributor.author","Hagemann, Johannes"],["dc.contributor.author","Rosselló, J. M."],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Schropp, A."],["dc.contributor.author","Seiboth, F."],["dc.contributor.author","Schroer, C. G."],["dc.contributor.author","Scholz, M."],["dc.contributor.author","Möller, J."],["dc.contributor.author","Hallmann, J."],["dc.contributor.author","Boesenberg, U."],["dc.contributor.author","Kim, C."],["dc.contributor.author","Zozulya, A."],["dc.contributor.author","Lu, W."],["dc.contributor.author","Shayduk, R."],["dc.contributor.author","Schaffer, R."],["dc.contributor.author","Madsen, A."],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2021-06-08T12:44:14Z"],["dc.date.available","2021-06-08T12:44:14Z"],["dc.date.issued","2021-06-08"],["dc.description.abstract","Cavitation bubbles can be seeded from a plasma following optical breakdown, by focusing an intense laser in water. The fast dynamics are associated with extreme states of gas and liquid, especially in the nascent state. This offers a unique setting to probe water and water vapor far-from equilibrium. However, current optical techniques cannot quantify these early states due to contrast and resolution limitations. X-ray holography with single X-ray free-electron laser pulses has now enabled a quasi-instantaneous high resolution structural probe with contrast proportional to the electron density of the object. In this work, we demonstrate cone-beam holographic flash imaging of laser-induced cavitation bubbles in water with nanofocused X-ray free-electron laser pulses. We quantify the spatial and temporal pressure distribution of the shockwave surrounding the expanding cavitation bubble at time delays shortly after seeding and compare the results to numerical simulations."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s41467-021-23664-1"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87172"],["dc.relation.issn","2041-1723"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights","CC BY 4.0"],["dc.subject.gro","x-ray imaging"],["dc.title","Pump-probe X-ray holographic imaging of laser-induced cavitation bubbles with femtosecond FEL pulses"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","107872"],["dc.bibliographiccitation.journal","Chemical Engineering and Processing"],["dc.bibliographiccitation.volume","150"],["dc.contributor.author","Sarac, Busra Ekim"],["dc.contributor.author","Stephens, Dwayne Savio"],["dc.contributor.author","Eisener, Julian"],["dc.contributor.author","Rosselló, Juan Manuel"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2021-04-14T08:26:50Z"],["dc.date.available","2021-04-14T08:26:50Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1016/j.cep.2020.107872"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17567"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82094"],["dc.language.iso","en"],["dc.notes","Access to the full text will be granted after the embargo expires on 20th February 2022."],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.relation","European Training Network for Continuous Sonication and Microwave Reactors"],["dc.relation.issn","0255-2701"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights.access","closedAccess"],["dc.title","Cavitation bubble dynamics and sonochemiluminescence activity inside sonicated submerged flow tubes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","52"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.lastpage","63"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Hagemann, Johannes"],["dc.contributor.author","Vaßholz, Malte"],["dc.contributor.author","Hoeppe, Hannes"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Rosselló, Juan M."],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Seiboth, Frank"],["dc.contributor.author","Schropp, Andreas"],["dc.contributor.author","Möller, Johannes"],["dc.contributor.author","Hallmann, Jörg"],["dc.contributor.author","Kim, Chan"],["dc.contributor.author","Scholz, Markus"],["dc.contributor.author","Boesenberg, Ulrike"],["dc.contributor.author","Schaffer, Robert"],["dc.contributor.author","Zozulya, Alexey"],["dc.contributor.author","Lu, Wei"],["dc.contributor.author","Shayduk, Roman"],["dc.contributor.author","Madsen, Anders"],["dc.contributor.author","Schroer, Christian G."],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2021-04-14T08:30:07Z"],["dc.date.available","2021-04-14T08:30:07Z"],["dc.date.issued","2021"],["dc.description.abstract","X-ray free-electron lasers (XFELs) have opened up unprecedented opportunities\r\nfor time-resolved nano-scale imaging with X-rays. Near-field propagationbased\r\nimaging, and in particular near-field holography (NFH) in its highresolution\r\nimplementation in cone-beam geometry, can offer full-field views of a\r\nspecimen’s dynamics captured by single XFEL pulses. To exploit this capability,\r\nfor example in optical-pump/X-ray-probe imaging schemes, the stochastic\r\nnature of the self-amplified spontaneous emission pulses, i.e. the dynamics of the\r\nbeam itself, presents a major challenge. In this work, a concept is presented to\r\naddress the fluctuating illumination wavefronts by sampling the configuration\r\nspace of SASE pulses before an actual recording, followed by a principal\r\ncomponent analysis. This scheme is implemented at the MID (Materials Imaging\r\nand Dynamics) instrument of the European XFEL and time-resolved NFH\r\nis performed using aberration-corrected nano-focusing compound refractive\r\nlenses. Specifically, the dynamics of a micro-fluidic water-jet, which is commonly\r\nused as sample delivery system at XFELs, is imaged. The jet exhibits rich\r\ndynamics of droplet formation in the break-up regime. Moreover, pump–probe\r\nimaging is demonstrated using an infrared pulsed laser to induce cavitation and\r\nexplosion of the jet."],["dc.identifier.doi","10.1107/S160057752001557X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83114"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1600-5775"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights","CC BY 4.0"],["dc.subject.gro","x-ray imaging"],["dc.title","Single-pulse phase-contrast imaging at free-electron lasers in the hard X-ray regime"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","987-994"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Osterhoff, Markus"],["dc.contributor.author","Vaßholz, Malte"],["dc.contributor.author","Hoeppe, Hannes Paul"],["dc.contributor.author","Rosselló, Juan Manuel"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Hagemann, Johannes"],["dc.contributor.author","Möller, Johannes"],["dc.contributor.author","Hallmann, Jörg"],["dc.contributor.author","Scholz, Markus"],["dc.contributor.author","Schaffer, Robert"],["dc.contributor.author","Boesenberg, Ulrike"],["dc.contributor.author","Kim, Chan"],["dc.contributor.author","Zozulya, Alexey"],["dc.contributor.author","Lu, Wei"],["dc.contributor.author","Shayduk, Roman"],["dc.contributor.author","Madsen, Anders"],["dc.contributor.author","Salditt, Tim"],["dc.date.accessioned","2021-05-07T07:22:19Z"],["dc.date.available","2021-05-07T07:22:19Z"],["dc.date.issued","2021-05-01"],["dc.description.abstract","Single-pulse holographic imaging at XFEL sources with 1012 photons delivered in pulses shorter than 100 fs reveal new quantitative insights into fast phenomena. Here, a timing and synchronization scheme for stroboscopic imaging and quantitative analysis of fast phenomena on time scales (sub-ns) and length-scales (≲100 nm) inaccessible by visible light is reported. A fully electronic delay-and-trigger system has been implemented at the MID station at the European XFEL, and applied to the study of emerging laser-driven cavitation bubbles in water. Synchronization and timing precision have been characterized to be better than 1 ns."],["dc.identifier.doi","10.1107/S1600577521003052"],["dc.identifier.pmid","33950007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84669"],["dc.language.iso","en"],["dc.relation.eissn","1600-5775"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Salditt (Structure of Biomolecular Assemblies and X-Ray Physics)"],["dc.rights","CC BY 4.0"],["dc.subject.gro","x-ray imaging"],["dc.title","Nanosecond timing and synchronization scheme for holographic pump-probe studies at the MID instrument at European XFEL"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Journal of Fluid Mechanics"],["dc.bibliographiccitation.volume","771"],["dc.contributor.author","Han, Bing"],["dc.contributor.author","Koehler, Karsten"],["dc.contributor.author","Jungnickel, Kerstin"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Vogel, Alfred"],["dc.date.accessioned","2018-11-07T09:57:33Z"],["dc.date.available","2018-11-07T09:57:33Z"],["dc.date.issued","2015"],["dc.description.abstract","The interaction of two laser-induced bubbles in bulk water is investigated. The strength and direction of the emerging liquid jets can be controlled by adjusting the relative bubble positions, the time difference between bubble generation, and the laser pulse energies determining the bubble sizes. Experimental and numerical studies are performed for millimetre-sized bubble pairs. Taking bubbles of equal energy, a maximum jet velocity is found for close anti-phase bubbles, i.e. when the second bubble is produced at the maximum volume of the first one and the bubble walls are almost touching and not merging. Under these conditions, one bubble produces a fast jet with a peak velocity of about 150 m s(-1) that reaches a distance into the surrounding liquid of at least three times the maximum bubble radius. Collapse of the other bubble results in a slow jet of large mass that rapidly converts into a ring vortex. Correspondingly, the interaction with adjacent structures is dominated either by localized jet impact or by shear stresses extending over a larger area. Furthermore, interactions between micrometre-sized bubble pairs are investigated numerically to understand and predict how the effects of the physical parameters on bubble dynamics would change when the bubbles become smaller. The results are discussed with respect to micropumping and opto-injection."],["dc.identifier.doi","10.1017/jfm.2015.183"],["dc.identifier.isi","000355985900029"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13842"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37184"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","1469-7645"],["dc.relation.issn","0022-1120"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 3.0"],["dc.title","Dynamics of laser-induced bubble pairs"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1708"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Soft Matter"],["dc.bibliographiccitation.lastpage","1722"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Visser, Claas Willem"],["dc.contributor.author","Frommhold, Philipp Erhard"],["dc.contributor.author","Wildeman, Sander"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lohse, Detlef"],["dc.contributor.author","Sun, Chao"],["dc.date.accessioned","2018-11-07T10:03:35Z"],["dc.date.available","2018-11-07T10:03:35Z"],["dc.date.issued","2015"],["dc.description.abstract","Technologies including (3D-) (bio-) printing, diesel engines, laser-induced forward transfer, and spray cleaning require optimization and therefore understanding of micrometer-sized droplets impacting at velocities beyond 10 m s(-1). However, as yet, this regime has hardly been addressed. Here we present the first time-resolved experimental investigation of microdroplet impact at velocities up to V-0 = 50 m s(-1), on hydrophilic and -phobic surfaces at frame rates exceeding 10(7) frames per second. A novel method to determine the 3D- droplet profile at sub-micron resolution at the same frame rates is presented, using the fringe pattern observed from a bottom view. A numerical model, which is validated by the side- and bottom-view measurements, is employed to study the viscous boundary layer inside the droplet and the development of the rim. The spreading dynamics, the maximal spreading diameter, the boundary layer thickness, the rim formation, and the air bubble entrainment are compared to theory and previous experiments. In general, the impact dynamics are equal to millimeter-sized droplet impact for equal Reynolds-, Weber- and Stokes numbers (Re, We, and St, respectively). Using our numerical model, effective scaling laws for the progression of the boundary layer thickness and the rim diameter are provided. The dimensionless boundary layer thickness develops in time (t) according to delta(BL) similar to D-0/root Re (t/tau)(0.45), and the diameter of the rim develops as D-Rim similar to D-0/root We (t/tau)(0.68), with drop diameter D-0 and inertial time scale tau = D-0/V-0. These scalings differ from previously assumed, but never validated, values. Finally, no splash is observed, at variance with many predictions but in agreement with models including the influence of the surrounding gas. This confirms that the ambient gas properties are key ingredients for splash threshold predictions."],["dc.identifier.doi","10.1039/c4sm02474e"],["dc.identifier.isi","000350043700006"],["dc.identifier.pmid","25607820"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11723"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38502"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Royal Soc Chemistry"],["dc.relation.issn","1744-6848"],["dc.relation.issn","1744-683X"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 3.0"],["dc.title","Dynamics of high-speed micro-drop impact: numerical simulations and experiments at frame-to-frame times below 100 ns"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]