The adsorption of ammonia on polycrystalline thorium
-
A. J. Bishop
Abstract
The chemistry of the actinides has long been an area of great interest to many researchers, due to the unusual nature of the f-orbital electrons. Electron spectroscopies provide a useful means to study the electronic structure of the 5f states, and how they affect the interactions of the actinide elements with various molecules. In this study the interaction of ammonia with a polycrystalline thorium surface at two different temperatures has been investigated using X-ray and ultraviolet photoelectron spectroscopic techniques. Exposure to ammonia at ambient temperature results in the formation of both nitride (Th-N) and NHx species, characterised by N1s photoemission peaks at 396.5 and 398.8 eV binding energy respectively, on the thorium surface. Exposure to ammonia at 100 K gives rise to an additional signal at 401.2 eV corresponding to physisorbed ammonia. Additional UPS results provided corroborating evidence for the effect of the surface temperature on the reaction with ammonia.
© by Oldenbourg Wissenschaftsverlag, München, Germany
Artikel in diesem Heft
- Preface
- Solubility of Pu and rare-earths in LiCl-Li2O melt
- Solubility of plutonium in MgCl2 and CaCl2 solutions in contact with metallic iron
- Complex formation and solubility of Pu(IV) with malonic and succinic acids
- New insights in the formation processes of Pu(IV) colloids
- Redox equilibria of Pu4+/Pu3+ and PuO22+/Pu4+ couples in molten NaCl-CsCl eutectic as measured by absorption spectrophotometry
- In search of an optimum plutonium density measurement fluid
- Some aspects of neptunium acetohydroxamic acid chemistry under acidic conditions
- Excitation spectra of near-infrared photoluminescence from Np(VI) in Cs2U(Np)O2Cl4
- Study of reaction of curium oxy-compound formation in molten chlorides
- Extraction behaviour of actinides and lanthanides in TALSPEAK, TRUEX and NPEX processes of UREX+
- Effect of oxide ions on separation factors of actinides from lanthanides in reductive extraction
- Solid phase precipitates in (Zr,Th)-OH-(oxalate, malonate) ternary aqueous system
- The adsorption of ammonia on polycrystalline thorium
- Formation and stability of actinide oxides: a valence band photoemission study
- Plutonium traces in atmospheric precipitation and in aerosols from Krakow and Bialystok
- Plutonium in the environment: key factors related to impact assessment in case of an accidental atmospheric release
- Unveiling the history of seized plutonium through nuclear forensic investigations
Artikel in diesem Heft
- Preface
- Solubility of Pu and rare-earths in LiCl-Li2O melt
- Solubility of plutonium in MgCl2 and CaCl2 solutions in contact with metallic iron
- Complex formation and solubility of Pu(IV) with malonic and succinic acids
- New insights in the formation processes of Pu(IV) colloids
- Redox equilibria of Pu4+/Pu3+ and PuO22+/Pu4+ couples in molten NaCl-CsCl eutectic as measured by absorption spectrophotometry
- In search of an optimum plutonium density measurement fluid
- Some aspects of neptunium acetohydroxamic acid chemistry under acidic conditions
- Excitation spectra of near-infrared photoluminescence from Np(VI) in Cs2U(Np)O2Cl4
- Study of reaction of curium oxy-compound formation in molten chlorides
- Extraction behaviour of actinides and lanthanides in TALSPEAK, TRUEX and NPEX processes of UREX+
- Effect of oxide ions on separation factors of actinides from lanthanides in reductive extraction
- Solid phase precipitates in (Zr,Th)-OH-(oxalate, malonate) ternary aqueous system
- The adsorption of ammonia on polycrystalline thorium
- Formation and stability of actinide oxides: a valence band photoemission study
- Plutonium traces in atmospheric precipitation and in aerosols from Krakow and Bialystok
- Plutonium in the environment: key factors related to impact assessment in case of an accidental atmospheric release
- Unveiling the history of seized plutonium through nuclear forensic investigations
