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Open AccessChemical bonding in americium oxides probed by X-ray spectroscopy
The electronic structure and the chemical state in Am binary oxides and Am-doped UO \(_2\) ...
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Article
Selective nitrogen adsorption via backbonding in a metal–organic framework with exposed vanadium sites
Industrial processes prominently feature π-acidic gases, and an adsorbent capable of selectively interacting with these molecules could enable important chemical separations1–4. Biological systems use accessible,...
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Open AccessChiral transcription in self-assembled tetrahedral Eu4L6 chiral cages displaying sizable circularly polarized luminescence
Predictable stereoselective formation of supramolecular assembly is generally believed to be an important but complicated process. Here, we show that point chirality of a ligand decisively influences its supra...
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Open AccessInsights into the sonochemical synthesis and properties of salt-free intrinsic plutonium colloids
Fundamental knowledge on intrinsic plutonium colloids is important for the prediction of plutonium behaviour in the geosphere and in engineered systems. The first synthetic route to obtain salt-free intrinsic ...
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Low-Temperature Organometallic Chemical Vapor Deposition of Transition Metals
A variety of transition-metal films have been grown by organometallic chemical vapor deposition (OMCVD) at low temperatures using hydrocarbon or hydrido-carbonyl metal complexes as precursors. The vapors of th...
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Article
Electrospray ionization mass spectrometry of the cerium(III)-phosphomolybdate complex (NH4)11Ce(PMo11O39)2
Electrospray ionization quadrupole ion trap mass spectrometry of the ammonium lanthanide(III) phosphomolybdate complex (NH4)11Ce(III)(PMo11O39)2 has been conducted revealing the Ce-POM complexes H2Ce(III)P2Mo22O7...
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Article
Actinide Science with a Soft X-ray Scanning Transmission X-ray Microscope (STXM)
Soft x-ray scanning transmission x-ray microscope (STXM) spectromicroscopy has been developed and employed to investigate several aspects of actinide chemistry and materials science at the Advanced Light Sourc...
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Article
Scanning Transmission X-ray Spectromicroscopy of Actinide Complexes
The fundamental characterization and understanding of 5f electron behavior in actinide complexes is imperative to provide an enhanced basis for the rational and accelerated development of improved processes re...
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Article
Tc and Re Behavior in Borosilicate Waste Glass Vapor Hydration Tests
Technetium (Tc), found in some nuclear wastes, is of particular concern with regard to long-term storage, because of its long-lived radioactivity and high mobility in the environment. Tc and rhenium (Re), comm...
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Soft X-ray scanning transmission X-ray microscopy (STXM) of actinide particles
A descriptive account is given of our most recent research on the actinide dioxides with the Advanced Light Source Molecular Environmental Science (ALS-MES) Beamline 11.0.2 soft X-ray scanning transmission X-r...
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Article
X-ray Absorption Fine Structure Studies of Speciation of Technetium in Borosilicate Glasses
A series of glass samples were prepared analogously to high level waste glass using either glass frit or glass precursors combined with a high level waste surrogate containing NaTcO4. Three different technetium s...
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Article
The Structure of U6+ Sorption Complexes on Vermiculite and Hydrobiotite
The sorption of the uranyl oxo-cation (UO22+)at different types of binding sites on layer silicate mineral surfaces was investigated. Well-characterized samples of vermiculite and hydrobiotite were exposed to aqu...
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Exafs Studies of Lanthanide Coordination in Crystalline Phosphates and Amorphous Phytates
As part of the Efficient Separations and Processing Integrated Program of the U.S. Department of Energy, technologies are being developed that can stabilize radioactive and hazardous contaminants in order to r...
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Characterization of the Interaction of Uranyl Ions with Humic Acids by X-Ray Absorption Spectroscopy
Humic substances are present throughout the environment in soil and natural water. They are organic macromolecules with a variable structural formula, molecular weight, and a wide variety of functional groups ...
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Application of Synchrotron Radiation Techniques to Chemical Issues in the Environmental Sciences
The problem of hazardous waste contamination in the environment has become an issue of central importance in society. As the number of remediation efforts taking place worldwide grows and the public awareness ...
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Article
X-Ray Absorption Studies of Uranium Sorption on Mineral Substrates
Uranium L3-edge x-ray absorption spectra have been measured for uranium-mineral sorption systems. An expansible layer silicate, vermiculite, was treated to obtain a collapsed phase, thereby limiting access to the...
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Article
Structural and chemical stability of thin films of Pt–Ga intermetallic compounds of GaAs(001)
Nearly single-phase thin films of three different Pt–Ga intermetallic compounds have been grown on GaAs(001) by co-deposition of Pt and Ga. The resultant films have been annealed at various temperatures and th...
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Article
Study of Thermodynamic Phase Stability of Intermetallic Thin Films of Pt2Ga, Ptga and PtGa2 on Gallium Arsenide
Epitaxial thin films of three different Pt-Ga intermetallic compounds have been grown on GaAs by molecular beam epitaxy (MBE). The resultant films have been annealed at various temperatures and then examined u...
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Article
Thermodynamically Stable Conducting Films of Intermetallic PtGa2 on Gallium Arsenide
The first epitaxial platinum gallium two (PtGa2) films have been grown on gallium arsenide (GaAs) (100) by co-evaporation of the elements under ultra-high vacuum conditions. An electron beam evaporator and a Knud...
