A5081966546- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Crystallography and Radiation Phenomena
- Advancements in Photolithography Techniques
- Photocathodes and Microchannel Plates
- Optical Coatings and Gratings
- Particle accelerators and beam dynamics
- Advanced Surface Polishing Techniques
- Magnetic properties of thin films
- Metal and Thin Film Mechanics
- Gyrotron and Vacuum Electronics Research
- Surface and Thin Film Phenomena
- Advanced Chemical Physics Studies
- Copper Interconnects and Reliability
- Medical Imaging Techniques and Applications
- X-ray Diffraction in Crystallography
- Enzyme Structure and Function
- Laser-Plasma Interactions and Diagnostics
- Optical measurement and interference techniques
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
Advanced Light Source
1997-2025
Lawrence Berkeley National Laboratory
2014-2023
Uppsala University
2021
University of California, Los Angeles
2018
Arizona State University
2018
Cornell University
2018
Lintec Corporation (Japan)
2017
Tongji University
2017
Argonne National Laboratory
2017
Bellingham Technical College
2017
Time-resolved x-ray imaging shows that the magnetization dynamics of a micron-sized pattern containing ferromagnetic vortex is determined by its handedness, or chirality. The out-of-plane in nanometer-scale core induces three-dimensional handedness planar magnetic structure, leading to precessional motion parallel subnanosecond field pulse. velocity was an order magnitude higher than expected from static susceptibility. These results demonstrate already well known be important biological...
We discuss the construction of a new SAXS/WAXS beamline at Advanced Light Source Lawrence Berkeley Laboratory. The is equipped with multilayer monochromator in order to obtain high X-ray flux. detrimental effects that increased bandwidth transmitted by this could have on data quality SAXS and WAXS patterns shown be negligible for experimental program intended operated beamline.
We present the development and characterization of a dedicated resonant soft x-ray scattering facility. Capable operation over wide energy range, beamline endstation are primarily used for from matter systems around carbon K-edge (∼285 eV). describe specialized design instrument characteristics beamline. Operational immediate interest to users such as polarization control, degree higher harmonic spectral contamination, detector noise delineated. Of special is rejection system that improves...
Time-resolved x-ray diffraction with picosecond temporal resolution is used to observe scattering from impulsively generated coherent acoustic phonons in laser-excited InSb crystals. The observed frequencies and damping rates are agreement a model based on dynamical theory coupled analytic solutions for the laser-induced strain profile. results consistent 12 ps thermal electron-acoustic phonon coupling time together an instantaneous component deformation-potential interaction. Above critical...
Antiferromagnetic domains in an epitaxial thin film, LaFeO(3) on SrTiO(3)(100), were observed using a high-spatial-resolution photoelectron emission microscope with contrast generated by the large x-ray magnetic linear dichroism effect at multiplet-split L edge of Fe. The antiferromagnetic are linked to 90 degrees twinned crystallographic regions film. Neel temperature film is reduced 70 kelvin relative bulk material, and this reduction attributed strain. These studies open door for...
Scanning X-ray microdiffraction (microSXRD) combines the use of high-brilliance synchrotron sources with latest achromatic focusing optics and fast large-area two-dimensional-detector technology. Using white beams or a combination monochromatic beams, this technique allows for orientation strain/stress mapping polycrystalline thin films submicrometer spatial resolution. The is described in detail as applied to study aluminium copper blanket lines following electromigration testing and/or...
Beamline 10.3.2 at the ALS is a bend-magnet line designed mostly for work on environmental problems involving heavy-metal speciation and location. It offers unique combination of X-ray fluorescence mapping, microspectroscopy micro-X-ray diffraction. The optics allow user to trade spot size flux in range 5–17 µm an energy 3–17 keV. focusing uses Kirkpatrick–Baez mirror pair image variable-size virtual source onto sample. Thus, can reduce effective source, thereby reducing sample, cost flux....
A review is given of the principles underlying X-ray magnetic circular (XMCD) and linear (XMLD) dichroism spectromicroscopies consisting polarized absorption spectroscopy in conjunction with scanning or imaging microscopy. The techniques are shown to have many useful important capabilities for study complex materials. They offer elemental specificity, chemical specificity variable depth sensitivity, among others. XMCD microscopy best suited ferromagnets ferrimagnets, it allows a quantitative...
We present the first images of a surface showing clear antiferromagnetic contrast. The were obtained for 10--80 nm thick NiO(100) films grown on Mg(100) by means x-ray magnetic linear dichroism spectroscopy in conjunction with high resolution photoelectron emission microscopy. sensitive lateral better than 50 reveal line defects that exhibit order reduced N\'eel temperature (455 K) relative to rest film and bulk (523 K). Analysis dependent allows us separate spin charge components effect.
At the Advanced Light Source an undulator beamline, with energy range from 6 to 30 eV, has been constructed for chemical dynamics experiments. The higher harmonics of are suppressed by a novel, windowless gas filter. In one branchline high-flux, 2% bandwidth radiation is directed toward end station photodissociation and crossed molecular-beam A photon flux 1016 photon/s measured at this station. second 6.65 m off-plane Eagle monochromator delivers narrow photoionoization studies. peak 3×1011...
Determining how environmentally important trace metals are sequestered in soils at the molecular scale is critical to developing a solid scientific basis for maintaining soil quality and formulating effective remediation strategies. The speciation of Zn Ni ferromanganese nodules from loess Mississippi Basin was determined by synergistic use three noninvasive synchrotron-based techniques: X-ray microfluorescence (μXRF), microdiffraction (μXRD), extended absorption fine structure spectroscopy...
A new facility for microdiffraction strain measurements and microfluorescence mapping has been built on beamline 12.3.2 at the advanced light source of Lawrence Berkeley National Laboratory. This benefits from hard x-radiation generated by a 6 T superconducting bending magnet (superbend). provides x-ray spectrum 5 to 22 keV flux within 1 μm spot ∼5×109 photons/s (0.1% bandwidth 8 keV). The radiation is relayed superbend focus in experimental hutch toroidal mirror. tailored two pairs...
Abstract Battery function is determined by the efficiency and reversibility of electrochemical phase transformations at solid electrodes. The microscopic tools available to study chemical states matter with required spatial resolution specificity are intrinsically limited when studying complex architectures their reliance on two-dimensional projections thick material. Here, we report development soft X-ray ptychographic tomography, which resolves in three dimensions 11 nm resolution. We an...
We experimentally investigate surface-plasmon assisted photoemission to enhance the efficiency of metallic photocathodes for high-brightness electron sources. A nanohole array-based copper surface was designed exhibit a plasmonic response at 800 nm, fabricated using focused ion beam milling technique, optically characterized and tested as photocathode in high power radio frequency photoinjector. Because larger absorption localization optical field intensity, charge yield observed under...
The performance of battery electrode materials is strongly affected by inefficiencies in utilization kinetics and cycle life as well size effects. Observations phase transformations these with high chemical spatial resolution can elucidate the relationship between processes mechanical degradation. Soft X-ray ptychographic microscopy combined absorption spectroscopy electron creates a powerful suite tools that we use to assess morphological changes lithium iron phosphate (LiFePO4) micro-...
The design of a high resolution photoemission electron microscope (PEEM) for the study magnetic materials is described. PEEM based on imaging photoemitted (secondary) electrons from sample irradiated by x rays. This permanently installed at Advanced Light Source bending magnet that delivers linearly polarized, and left right circularly polarized radiation in soft x-ray range. can utilize several contrast mechanisms to surface subsurface properties materials. A wide range be utilized with...
The availability of high brilliance third generation synchrotron sources together with progress in achromatic focusing optics allows us to add submicron spatial resolution the conventional century-old x-ray diffraction technique. new capabilities include possibility map situ, grain orientations, crystalline phase distribution, and full strain/stress tensors at a very local level, by combining white monochromatic microbeam diffraction. This is particularly relevant for technology industry...
A new facility for high-pressure diffraction and spectroscopy using diamond anvil cells has been built at the Advanced Light Source on beamline 12.2.2. This benefits from hard X-radiation generated by a 6 T superconducting bending magnet (superbend). Useful X-ray flux is available between 5 keV 35 keV. The radiation transferred superbend to experimental enclosure brightness-preserving optics of beamline. These are comprised plane parabola collimating mirror, followed Kohzu monochromator...
The performance of ALS beamline 7.0 is described. This an integrated system for delivering radiation from a 5 cm period undulator to spectroscopy and microscopy experiments across the range photon energies 60 1200 eV. engineered deliver highest possible flux, with negligible deformation optic surfaces due heating. Two experiment stations are served rapid interchangeability. measured operational parameters, resolution flux delivered, refocus light into small spot at all discussed.
A charge-coupled device (CCD) capable of 200 Mpixels/s readout has been designed and fabricated on thick, high-resistivity silicon. The CCDs, up to 600 microm are fully depleted, ensuring good infrared x-ray detection efficiency, together with a small point spread function. High speed, analog performance, is obtained by the use large number parallel output ports. set companion 16-channel custom integrated circuits, 15 bits dynamic range, used read out CCD. gate array-controlled back end data...
In this Letter, we report on the efficient generation of electrons from metals using multiphoton photoemission by use nanostructured plasmonic surfaces to trap, localize, and enhance optical fields. The surface increases absorption over normal more than an order magnitude, due localization fields, results in 6 orders magnitude increase effective nonlinear quantum yield. We demonstrate that achieved yield is high enough for rf photoinjectors operating as electron sources MHz repetition rate...