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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Imaging ionomer in fuel cell catalyst layers with synchrotron nano transmission x-ray microscopy
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A synchrotron X-ray diffraction study of strain and microstrain distributions in [alpha]-Zr caused by hydride precipitation
Abstract not provided
Powder X-ray diffraction of escitalopram oxalate oxalic acid hydrate, (C[subscript 20]H[subscript 21
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Deciphering the Local Environment of Single-Atom Catalysts with X-ray Absorption Spectroscopy
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X-ray Crystal Structure of Thorium Tetrahydroborate, Th(BH 4 ) 4 , and Computational Studies of An(BH 4 ) 4 (An = Th, U)
Here the crystal structure of Th(BH 4 ) 4 is described. Two of the four BH 4 – ions are terminal and tridentate (κ 3 ), whereas the other two bridge between neighboring Th IV centers in a κ 2 ,κ 2 (i.e., bis-bidentate) fashion. Thus, each thorium center is bound to six BH 4 – groups by 14 Th–H bonds. The six boron atoms describe a distorted octahedron in which the κ 3 -BH 4 – ions are mutually cis; the 14 ligating hydrogen atoms define a highly distorted bicapped hexagonal antiprism. The thorium centers are linked into a polymer consisting of interconnected helical chains wound about 4-fold screw axes. The structures of An(BH 4 ) 4 (An = Th, U) were also investigated by DFT. The geometries of [An(BH 4 ) 6 ] 2– , [An3(BH 4 ) 16 ] 4– , and [An 5 (BH 4 ) 26 ] 6– fragments of the polymeric structures were optimized at the B3LYP and/or PBE levels. Most calculated geometries are 14-coordinate and agree with the experimental structures, but isolated [Th(BH 4 ) 6 ] 2– units are predicted to feature 16-coordinate Th IV centers.
Resonant Inelastic Soft X-ray Scattering and X-ray Emission Spectroscopy of Solid Proline and Proline Solutions
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In Situ X-ray Absorption Spectroscopy of PtNi-Nanowire/Vulcan XC-72R under Oxygen Reduction Reaction in Alkaline Media
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X-ray Crystallographic Structure and Oligomerization of Gloeobacter<\em> Rhodopsin
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Time-resolved radioluminescence of the Cu( i ) cluster Cu 4 I 6 2− . Different responses to photo, X-ray, β-ray and α-particle excitation
The temporal response of radioluminescence from crystalline Cu 4 I 6 2− salts displays an initial fast component owing to excited state densities generated by high energy radiation.
X-ray fluorescence microscopy and X-ray absorption spectroscopy reveal the stability of the plecstatin-1 scaffold in biological model systems: comparison of Ru, Os and Ir analogues
Ligand exchange reactions often impact our understanding of metal-based cancer drug prototype actions. Here we makein situmeasurements of metal distribution and speciation to show that these are limited for plecstatin analogues.
X-ray imaging of liquid-liquid Mg cavitation
The coupling of dynamic loading platforms with synchrotron light sources have enabled experiments examining void formation in optically opaque materials. Much like spallation in a solid, cavitation occurs when rarefaction waves collide within a liquid. The resulting deformation leads to a complex flow field with numerous voids. It has been suggested that compaction of such a structure may be a significant source of ejecta (i.e. shallow bubble collapse). Experiments imaging supported and unsupported shocks interacting with a free surface in shock melted Mg with synchrotron radiation are presented. Here, the results are used to examine the structure of a cavitation plane that forms in the unsupported case and provide an estimate of the porosity within this region.
Effects of x-ray free-electron laser pulse intensity on the Mn K β 1,3 x-ray emission spectrum in photosystem II—A case study for metalloprotein crystals and solutions
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Signatures of misalignment in x-ray cavities of cavity-based x-ray free-electron lasers
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Gamma ray signals from cosmic ray scattering on axionlike particles
Not Available
Origin of itinerant carriers in antiferromagnetic LaFe 1-x MoxO 3 studied by x-ray spectroscopies
Abstract not provided