Maximilian Bucher
A5030479812- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Laser-induced spectroscopy and plasma
- Crystallography and Radiation Phenomena
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Enzyme Structure and Function
- Diamond and Carbon-based Materials Research
- nanoparticles nucleation surface interactions
- Medical Imaging Techniques and Applications
- Laser Design and Applications
- Computational Physics and Python Applications
- Algal biology and biofuel production
- Spectroscopy and Laser Applications
- Magnetic confinement fusion research
- Plant Virus Research Studies
- Photosynthetic Processes and Mechanisms
- Geophysics and Sensor Technology
Argonne National Laboratory
2016-2022
SLAC National Accelerator Laboratory
2015-2022
Menlo School
2016-2022
Linac Coherent Light Source
2015-2022
New capabilities at X-ray free-electron laser facilities allow the generation of two-colour femtosecond pulses, opening possibility performing ultrafast studies X-ray-induced phenomena. Particularly, experimental realization hetero-site-specific X-ray-pump/X-ray-probe spectroscopy is special interest, in which an pump pulse absorbed one site within a molecule and probe follows dynamics another same molecule. Here we show evidence hetero-site pump-probe signal. By using 10-fs are able to...
Abstract Single particle diffractive imaging data from Rice Dwarf Virus (RDV) were recorded using the Coherent X-ray Imaging (CXI) instrument at Linac Light Source (LCLS). RDV was chosen as it is a well-characterized model system, useful for proof-of-principle experiments, system optimization and algorithm development. RDV, an icosahedral virus of about 70 nm in diameter, aerosolized injected into approximately 0.1 μm diameter focused hard beam CXI LCLS. Diffraction patterns with signal to...
Ultrafast x-ray heating of clusters leads to bond contraction in the solid-to-plasma transition.
The Atomic, Molecular and Optical Science (AMO) instrument at the Linac Coherent Light Source (LCLS) provides a tight soft X-ray focus into one of three experimental endstations. flexible design is optimized for studying wide variety phenomena requiring peak intensity. There suite spectrometers two photon area detectors available. An optional mirror-based split-and-delay unit can be used pump–probe experiments. Recent scientific highlights illustrate imaging, time-resolved spectroscopy...
The possibility of imaging single proteins constitutes an exciting challenge for x-ray lasers. Despite encouraging results on large particles, small particles has proven to be difficult two reasons: not quite high enough pulse intensity from currently available lasers and, as we demonstrate here, contamination the aerosolized molecules by nonvolatile contaminants in solution. amount sample depends initial droplet size during aerosolization. Here, show that, with our electrospray injector,...
Abstract Single-particle diffraction from X-ray Free Electron Lasers offers the potential for molecular structure determination without need crystallization. In an effort to further develop technique, we present a dataset of coherent soft images Coliphage PR772 virus, collected at Atomic Molecular Optics (AMO) beamline with pnCCD detectors in LAMP instrument Linac Coherent Light Source. The diameter ranges 65–70 nm, which is considerably smaller than previously reported ~600 nm Mimivirus....
Abstract Intense x-ray free-electron laser (XFEL) pulses hold great promise for imaging function in nanoscale and biological systems with atomic resolution. So far, however, the spatial resolution obtained from single shot experiments lags averaging static experiments. Here we report on a combined computational experimental study about ultrafast diffractive of sucrose clusters which are benchmark organic samples. Our theoretical model matches data water window to keV regime. The large-scale...
Helium nanodroplets are considered ideal model systems to explore quantum hydrodynamics in self-contained, isolated superfluids. Rotation of a superfluid droplet is manifested as collection vortices. Here, the authors use single-shot femtosecond X-ray coherent diffractive imaging investigate shapes and vorticity rotating ${}^{4}$He droplets. They find that most diffraction contours exhibit noticeable ellipticity. A smaller but still significant number distorted marked by regions high...
Abstract An accurate description of the interaction intense hard X-ray pulses with heavy atoms, which is crucial for many applications free-electron lasers, represents a hitherto unresolved challenge theory because enormous number electronic configurations and relativistic effects, need to be taken into account. Here we report results on multiple ionization xenon atoms by ultra-intense (about 10 19 W/cm 2 ) femtosecond at photon energies from 5.5 8.3 keV present theoretical model capable...
Abstract When materials are exposed to X-ray pulses with sufficiently high intensity, various nonlinear effects can occur. The most fundamental one consists of stimulated electronic decays after resonant absorption X-rays. Such enhance the number emitted photons and emission direction is confined that stimulating incident which clone themselves in process. Here we report observation elastic (REXS) inelastic (RIXS) scattering near cobalt L 3 edge solid Co/Pd multilayer samples. We observe an...
With the invention of femtosecond X-ray free-electron lasers (XFELs), studies light-induced chemical reaction dynamics and structural reach a new era, allowing for time-resolved diffraction spectroscopy. To ultimately probe coherent electron nuclear on their natural time length scales, nonlinear spectroscopy schemes have been proposed. In this contribution, we want to critically assess experimental realisation at current-day XFEL sources, by presenting first attempts demonstrate stimulated...
The free expansion of a planar plasma surface is fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. significance the associated spatiotemporal motion ranges from astrophysics and controlled fusion laser machining, high-harmonic generation, mirrors, laser-particle acceleration. Here, we show that x-ray coherent diffractive imaging can surpass existing approaches enables quantitative real-time analysis sudden nanoplasmas. For...
The concomitant motion of electrons and nuclei on the femtosecond time scale marks fate chemical biological processes. Here we demonstrate ability to initiate track ultrafast electron rearrangement bond breaking site-specifically in real for carbon monoxide diatomic molecule. We employ a local resonant x-ray pump at oxygen atom probe shifts core-electron binding energy. observe charge redistribution accompanying core-excitation followed by Auger decay, eventually leading dissociation hole...
The Laser Applications in Materials Processing (LAMP) instrument is a new end-station for soft X-ray imaging, high-field physics, and ultrafast science experiments that available to users at the Linac Coherent Light Source (LCLS) free-electron laser. While resides Atomic, Molecular Optical hutch, its components can be used any LCLS beamline. has modular design provides high flexibility order meet user-defined experimental requirements specifications. ultra-high-vacuum environment supports...
Using ultrafast ≃2.5 fs and ≃25 self-amplified spontaneous emission pulses of increasing intensity a novel experimental scheme, we report the concurrent increase stimulated in forward direction loss out-of-beam diffraction contrast for Co/Pd multilayer sample. The results are quantitatively accounted by statistical description conjunction with optical Bloch equations. dependence sample response on incident intensity, coherence time, energy jitter employed reveals importance increased control...
Femtosecond laser pulses have opened new frontiers for the study of ultrafast phase transitions and nonequilibrium states matter. In this Letter, we report on structural dynamics in atomic clusters pumped with intense near-infrared (NIR) into a nanoplasma state. Employing wide-angle scattering femtosecond x-ray from free-electron source, find that highly excited xenon nanoparticles retain their crystalline bulk structure density inner core long after driving NIR pulse. The observed emergence...
Significance Understanding the atomic-scale mechanism of crystallization is a fundamental issue in statistical mechanics and basis for synthesis novel materials. We investigated structures single xenon nanoparticles at early stage formation by exploiting femtosecond single-shot X-ray diffraction approach. found coexistence highly stacking-disordered structure stable face-centered cubic same nanoparticles, suggesting that proceeds via an intermediate phase. The results shine light on stages...
The interaction of intense femtosecond x-ray pulses with molecules sensitively depends on the interplay between multiple photoabsorptions, Auger decay, charge rearrangement, and nuclear motion. Here, we report a combined experimental theoretical study ionization fragmentation iodomethane (CH3I) by ultraintense (∼1019 W/cm2) at 8.3 keV, demonstrating how these dynamics depend pulse energy duration. We show that timing steps leading to particular reaction product and, thus, product's final...
Strong-field ionization of nanoscale clusters provides excellent opportunities to study the complex correlated electronic and nuclear dynamics near-solid density plasmas. Yet, monitoring ultrafast, nanoscopic in real-time is challenging, which often complicates a direct comparison between theory experiment. Here, near-infrared laser-induced plasma ∼600 nm diameter helium droplets are studied by femtosecond time-resolved x-ray coherent diffractive imaging. An anisotropic, ∼20 wide surface...
Characterizing and controlling the uniformity of nanoparticles is crucial for their application in science technology because crystalline defects strongly affect unique properties. Recently, ultra-short ultra-bright X-ray pulses provided by free-electron lasers (XFELs) opened up possibility structure determination nanometre-scale matter with Å spatial resolution. However, it often difficult to reconstruct 3D structural information from single-shot diffraction patterns owing random...
Extreme-ultraviolet emission at 65-nm wavelength from xenon nanoclusters irradiated by an intense pulse of soft x rays a free-electron laser is investigated in joint experimental-theoretical study. Clear indications long-lived population inversion, and subsequent amplified spontaneous emission, are identified.
Abstract Single Particle Imaging (SPI) with intense coherent X-ray pulses from free-electron lasers (XFELs) has the potential to produce molecular structures without need for crystallization or freezing. Here we present a dataset of 285,944 diffraction patterns aerosolized Coliphage PR772 virus particles injected into femtosecond Linac Coherent Light Source (LCLS). Additional exposures background information are also deposited. The data were collected at Atomic, Molecular and Optical Science...
The possibility of imaging single proteins constitutes an exciting challenge for X-ray lasers. Despite encouraging results on large particles, small particles has proven to be difficult two reasons: not quite high enough pulse intensity from currently available lasers and, as we demonstrate here, contamination the aerosolised molecules by non-volatile contaminants in solution. amount sample depends initial droplet-size during aerosolisation. Here show that with our electrospray injector can...
Atomic clusters can serve as ideal model systems for exploring ultrafast (∼100 fs) laser-driven ionization dynamics of dense matter on the nanometer scale. Resonant absorption optical laser pulses enables heating to temperatures order 1 keV at near solid density conditions. To date, direct probing transient states such nano-plasmas was limited coherent x-ray imaging. Here we present first measurement spectrally resolved incoherent scattering from clusters, enabling measurements temperature,...