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Statistical analysis of anthropogenic non-methane VOC variability at a European background location (Jungfraujoch, Switzerland)
(2009)Atmospheric Chemistry and PhysicsIn-situ measurements of 7 volatile hydrocarbons, CxHy, and 3 chlorinated organic compounds, CxHyClz, were performed at Jungfraujoch (Switzerland) during eight years (2000–2007). The analysis of 4-h resolved non-methane volatile organic compounds (NMVOCs) was achieved by using gas-chromatography coupled with mass spectrometry (GC-MS). Variabilities in the NMVOC time series dataset were modeled by factor analysis (positive matrix factorization, ...Journal Article -
The Subduction Dichotomy of Strong Plates and Weak Slabs
(2017)Solid EarthA key element of plate tectonics on Earth is that the lithosphere is subducting into the mantle. Subduction results from forces that bend and pull the lithosphere into the interior of the Earth. Once subducted, lithospheric slabs are further modified by dynamic forces in the mantle, and their sinking is inhibited by the increase in viscosity of the lower mantle. These forces are resisted by the material strength of the lithosphere. Using ...Journal Article -
Versatile attosecond beamline in a two-foci configuration for simultaneous time-resolved measurements
(2014)Review of Scientific InstrumentsWe present our attoline which is a versatile attosecond beamline at the Ultrafast Laser Physics Group at ETH Zurich for attosecond spectroscopy in a variety of targets. High-harmonic generation (HHG) in noble gases with an infrared (IR) driving field is employed to generate pulses in the extreme ultraviolet (XUV) spectral regime for XUV-IR cross-correlation measurements. The IR pulse driving the HHG and the pulse involved in the measurements ...Journal Article -
Nonlinear coupled equations for electrochemical cells as developed by the general equation for nonequilibrium reversible-irreversible coupling
(2014)The Journal of Chemical PhysicsWe show how the Butler-Volmer and Nernst equations, as well as Peltier effects, are contained in the general equation for nonequilibrium reversible and irreversible coupling, GENERIC, with a unique definition of the overpotential. Linear flux-force relations are used to describe the transport in the homogeneous parts of the electrochemical system. For the electrode interface, we choose nonlinear flux-force relationships. We give the general ...Journal Article -
Combining attosecond XUV pulses with coincidence spectroscopy
(2014)Review of Scientific InstrumentsHere we present a successful combination of an attosecond beamline with a COLTRIMS apparatus, which we refer to as AttoCOLTRIMS. The setup provides either single attosecond pulses or attosecond pulse trains for extreme ultraviolet-infrared pump-probe experiments. We achieve full attosecond stability by using an active interferometer stabilization. The capability of the setup is demonstrated by means of two measurements, which lie at the ...Journal Article -
Microphysical properties of synoptic-scale polar stratospheric clouds
(2014)Atmospheric Chemistry and PhysicsIn January 2010 and December 2011, synoptic-scale polar stratospheric cloud (PSC) fields were probed during seven flights of the high-altitude research aircraft M-55 Geophysica within the RECONCILE (Reconciliation of essential process parameters for an enhanced predictability of Arctic stratospheric ozone loss and its climate interaction) and the ESSenCe (ESSenCe: ESA Sounder Campaign) projects. Particle size distributions in a diameter ...Journal Article -
Janus wood membranes for autonomous water transport and fog collection
(2020)Journal of Materials Chemistry AAutonomous and directional transport of liquids is crucial for many applications, ranging from microreactors to water harvesting. Particularly, Janus membranes, with asymmetric wettability on two sides, present enticing opportunities to address this challenge. With the inner driving force arising from the asymmetric wettability, Janus membranes can promote the desired transport without an external energy input. However, the elaborate ...Journal Article -
Decoded fingerprints of hyperresponsive, expanding product space: polyether cascade cyclizations as tools to elucidate supramolecular catalysis
(2022)Chemical ScienceSimple enough to be understood and complex enough to be revealing, cascade cyclizations of diepoxides are introduced as new tools to characterize supramolecular catalysis. Decoded product fingerprints are provided for a consistent set of substrate stereoisomers, and shown to report on chemo-, diastereo- and enantioselectivity, mechanism and even autocatalysis. Application of the new tool to representative supramolecular systems reveals, ...Journal Article -
On the absolute photoionization cross section and threshold photoelectron spectrum of two reactive ketenes in lignin valorization: fulvenone and 2-carbonyl cyclohexadienone
(2022)Physical Chemistry Chemical PhysicsWe report the absolute photoionization cross section (PICS) of fulvenone and 2-carbonyl cyclohexadienone, two crucial ketene intermediates in lignin pyrolysis, combustion and organic synthesis. Both species were generated in situ by pyrolyzing salicylamide and dectected via imaging photoelectron photoion coincidence spectroscopy. In a deamination reaction, salicylamide loses ammonia yielding 2-carbonyl cyclohexadienone, a ketoketene, which ...Journal Article -
Helium structures around SF5+ and SF6+: novel intermolecular potential and mass spectrometry experiments
(2022)Physical Chemistry Chemical PhysicsHelium clusters around the recently experimentally observed sulphur hexafluoride SF6+ and sulphur pentafluoride SF5+ ions are investigated using a combined experimental and theoretical effort. Mass spectrometry ion yields are obtained and the energetics and structure of the corresponding He-N-SF6+ and He-N-SF5+ clusters are analyzed using path integral molecular dynamics calculations as a function of N, the number of He atoms, employing ...Journal Article