Sergei Butorin

Sergei Butorin
Uppsala University | UU · Department of Physics and Astronomy

Associate Professor

About

139
Publications
18,637
Reads
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3,302
Citations
Citations since 2016
22 Research Items
1413 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Introduction
PhD in physics at Uppsala University (Sweden) in 1993. After completing a postdoc at MAXII-laboratory moved back to Uppsala University and was appointed as Docent in Physics with Specialization in Atomic, Molecular and Condensed Matter Physics in 2007. Current research interests include energy related materials.

Publications

Publications (139)
Preprint
Full-text available
We report on a combined experimental and theoretical study on CrI3 single crystals by employing the polarization dependence of resonant inelastic X-ray scattering (RIXS). Our investigations reveal multiple Cr 3d orbital splitting (dd excitations) as well as magnetic dichroism (MD) in the RIXS spectra which is evidence of spin-flip in the dd excitat...
Article
A novel pentavalent plutonium solid phase was observed on the pathway from aqueous PuVI to PuO2 nanoparticles, as reported by K. O. Kvashnina et al. in their Communication (DOI: 10.1002/anie.201911637). This was achieved by combining a high‐energy‐resolution fluorescence detection method at the Pu M4 and L3 edges with electronic‐structure calculati...
Article
Eine neuartige feste Phase von pentavalentem Plutonium wurde auf dem Reaktionspfad von wässrigem PuVI zu PuO2‐Nanopartikeln beobachtet, wie K. O. Kvashnina et al. in ihrer Zuschrift (DOI: 10.1002/ange.201911637) berichten. Erreicht wurde dies durch die Kombination aus einer Fluoreszenzdetektion mit hoher Energieauflösung an den M4‐ und L3‐Kanten vo...
Article
Full-text available
We report here experimental evidence that the formation of PuO 2 nanoparticles from oxidized Pu(VI) under alkaline conditions proceeds through the formation of an intermediate Pu(V) solid phase, similar to NH 4 PuO 2 CO 3 , which is stable over a period of several months. For the first time, state‐of‐the‐art experiments at Pu M 4 and at L 3 absorpt...
Article
Full-text available
We report here experimental evidence that the formation of PuO 2 nanoparticles from oxidized Pu(VI) under alkaline conditions proceeds through the formation of an intermediate Pu(V) solid phase, similar to NH 4 PuO 2 CO 3 , which is stable over a period of several months. For the first time, state‐of‐the‐art experiments at Pu M 4 and at L 3 absorpt...
Article
Understanding the complex chemistry of functional nanomaterials is of fundamental importance. Controlled synthesis and characterization at the atomic level is essential to gain deeper insight into the unique chemical reactivity exhibited by many nanomaterials. Cerium oxide nanoparticles have many industrial and commercial application resulting from...
Article
We report on properties of BaTiO3 thin films where the bandgap is tuned via aliovalent doping of Mn and Nb ions co-doped at the Ti site. The doped films show single-phase tetragonal structure, growing epitaxially with a smooth interface to the substrate. Using piezoforce microscopy, we find that both doped and undoped films exhibit good ferroelectr...
Article
Developing characterization techniques and analysis methods adapted to the investigation of nanoparticles (NPs) is of fundamental importance considering the role of these materials in many fields of research. The study of actinide based NPs, despite their environmental relevance, is still underdeveloped compared to that of NPs based on stable and l...
Article
Full-text available
Valence band electronic structure of mixed uranium oxides (UO2, U4O9, U3O7, U3O8, b-UO3) has been studied by the resonant inelastic X-ray scattering (RIXS) technique at the U M5 edge and...
Article
The charge compensation mechanisms in UyNd1−yO2±x and its consequence on the overall O stoichiometry (or O/M ratio where M = Nd + U) have been studied through the uranium valence state mixture evolution as a function of Nd content up to y = 0.62 by means of high energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) at t...
Article
Full-text available
Bismuth halide compounds as a non-toxic alternative are increasingly investigated for their potential in optoelectronic devices and for their rich structural chemistry. Hard x-ray spectroscopy was applied to the ternary bismuth halide Cs3Bi2I9 and its related precursor BiI3 and CsI to understand its electronic structure at an atomic level. We speci...
Article
Mixed valence O-doped UO2+x and photoexcited UO2 containing transitory U3+ and U5+ host a coherent polaronic quantum phase (CPQP) that exhibits the characteristics of a Fröhlich-type, nonequilibrium, phonon-coupled Bose-Einstein condensate whose stability and coherence are amplified by collective, anharmonic motions of atoms and charges. Complement...
Article
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We report the significant role of synthetic routes and the importance of solvents in the synthesis of organic–inorganic lead iodide materials. Through one route, the intercalation of dimethylformamide in the crystal structure was observed leading to a one--dimensional (1D) [NH3(CH2)4NH3]Pb2I6 structure of the product. This product was compared with...
Article
Full-text available
A systematic x-ray absorption study at the U $3d$, $4d$ and $4f$ edges of UO$_2$ was performed and the data were analyzed within framework of the Anderson impurity model. By applying the high-energy-resolution fluorescence-detection (HERFD) mode of x-ray absorption spectroscopy (XAS) at the U $3d_{3/2}$ edge and conducting the XAS measurements at t...
Article
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The effect of La doping on the electronic structure of U in UO2 was studied using an advanced technique, namely, X-ray absorption spectroscopy (XAS) in the high-energy-resolution fluorescence-detection (HERFD) mode, at the U 3d3/2 (M4) edge. Thanks to a significant reduction of the core-hole lifetime broadening and distinct chemical shifts of the H...
Article
Full-text available
Significance This work is to our knowledge the first illustration of the ability of the high-energy resolution fluorescence-detection X-ray absorption spectroscopy (HERFD-XAS) technique to directly probe the crystal-field splitting in the 5 f shell of actinides. This is a breakthrough for actinide science, allowing for the easy extraction of desire...
Article
The electronic structure of U(V) - and U(VI) -containing uranates NaUO3 and Pb3 UO6 was studied by using an advanced technique, namely X-ray absorption spectroscopy (XAS) in high-energy-resolution fluorescence-detection (HERFD) mode. Due to a significant reduction in core-hole lifetime broadening, the crystal-field splittings of the 5f shell were p...
Article
A systematic x-ray absorption study at actinide $N_{6,7}$ ($4f\rightarrow6d$ transitions) edges was performed for light-actinide oxides including data obtained for the first time for NpO$_2$, PuO$_2$ and UO$_3$. The measurements were supported by \textit{ab-initio} calculations based on local-density-approximation with added $5f$-$5f$ Coulomb inter...
Article
Valence-to-core resonant inelastic x-ray scattering (RIXS) and high energy resolution fluorescence detection (HERFD) x-ray absorption measurements were performed at the U L3 edges of UO2 and UO2(NO3)2(H2O)6. The results are compared with model calculations based on the local-density-approximation formalism with taking into account Coulomb interacti...
Article
Full-text available
Soft x-ray emission and absorption spectroscopic data are reported for the O 1s region of a single crystal of UO2, a polycrystalline NpO2 sample, and a single crystal of PuO2. The experimental data are interpreted using first-principles correlated-electron calculations within the framework of the density functional theory with added Coulomb U inter...
Article
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We report here the first direct observation of U(V) in uranium binary oxides and analyze the gradual conversion of the U oxidation state in the mixed uranium systems. Our finding clarifies previous contradicting results and provides important input for the geological disposal of spent fuel, recycling applications, and chemistry of uranium species.
Article
The study addresses the possibilities of immobilizing the mobile species of actinides in the geosphere using metallic iron. Sorption on corroding iron is well known, but there have been uncertainties as to the possibilities of reducing the actinyl species to sparingly soluble oxides and, thereby, permanently immobilizing them. Resonant inelastic x-...
Article
Soft X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) have been performed on several nickel-containing bioinorganic complexes. RIXS spectral features are shown to be informative and diagnostic for the different oxidation states (Ni II vs Ni III) and spin states (high spin Ni II vs low spin Ni II) in these bioinorga...
Article
The influence of substrate-induced perturbations on the band structure of graphene has been investigated by soft X-ray emission spectroscopy (XES) for graphene on Ni(1 1 1). The band-dispersion features of graphene on Ni(1 1 1) are different from those of HOPG and 'quasi-freestanding' graphene (graphene/Cu) because of the strong interfacial interac...
Article
Full-text available
The electrical resistivity of amorphous Fe(100-x)Zr(x) metal alloy films and multilayers has been investigated in a wide temperature and composition range. The overall behavior of the resistivity is consistent with bulk measurements, exhibiting prominent semiconductor-like changes at low temperatures. The transition from positive (metallic) to nega...
Article
Full-text available
Nanoparticles of iron oxide generated by wearing of vehicles have been modelled with a tailored solution of size-uniform engineered magnetite particles produced by the Bradley reaction, a solvothermal metal-organic approach rendering hydrophilic particles. The latter does not bear any pronounced surface charge in analogy with that originating from...
Article
Fluorescence yield (FY) detected x-ray absorption spectra (XAS) of 3d transition metal ions are calculated from the integrated 2p3d resonant x-ray emission spectra. The resulting FY-XAS spectra are compared with the normal XAS spectra corresponding to the absorption cross section and significant deviations between the two spectra are found. This im...
Article
The electronic structure of copper sulfides was studied using X-ray absorption at Cu K and L2,3 and S L2,3 edges and X-ray emission spectroscopy at S L2,3 thresholds. The experimental data were compared with results of local density approximation calculations taking into account the calculated valence band contributions and core-level chemical shif...
Article
Full-text available
Cu Kβ2,5 X-ray emission and resonant inelastic X-ray scattering measurements were performed on monovalent and divalent copper compounds. The data were compared with the results of local-density-approximation calculations. The methods were found to be efficient tools for studies of Cu 4p states in the valence band and for distinguishing between diff...
Article
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We study both theoretically and experimentally the photon-in and photon-out spectra of CeO2, which are caused by the Ce 2p to Ce 5d excitation followed by the three different de-excitation channels: (i) Ce 3d to Ce 2p (denoted by 3d-RXES), (ii) O 2p to Ce 2p (v-RXES), and (iii) Ce 5d to Ce 2p (RIXS). In 3d- and v-RXES, the 5d electron plays a role...
Article
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Since its inauguration in 2005, the INE-Beamline for actinide research at the synchrotron source ANKA (KIT North Campus) provides dedicated instrumentation for x-ray spectroscopic characterization of actinide samples and other radioactive materials. R&D work at the beamline focuses on various aspects of nuclear waste disposal within INE's mission t...
Article
By means of theoretical modeling and experimental synthesis and characterization, we investigate the structural properties of amorphous Zr-Si-C. Two chemical compositions are selected, Zr0.31Si0.29C0.40 and Zr0.60Si0.33C0.07. The amorphous structures are generated in the theoretical part of our work, by the stochastic quenching (SQ) method, and det...
Article
Full-text available
Resonant soft X-ray scattering spectra of a La0.5Ca0.5MnO3 thin film were measured at varying energies of the incident photon beam across Mn 2p thresholds. The data are analyzed within the framework of the Anderson impurity model and full multiplet theory. The scattering profiles of the film are reasonably well reproduced by model calculations for...
Article
The electronic structure of the conjugated polymer, polyaniline, has been studied by resonant and nonresonant X-ray emission spectroscopy using synchrotron radiation for the excitation. The measurements were made on polyaniline and a few doped (protonated) phases for both the carbon and nitrogen contents. The resonant X-ray emission spectra show de...
Article
Resonant soft X-ray Raman scattering measurements on NiO have been made at photon energies across the Ni 2p absorption edges. The details of the spectral features are identified as Raman scattering due to d-d and charge-transfer excitations. The spectra are interpreted within the single impurity Anderson model, including multiplets, crystal-field a...
Article
The electronic structure of the heavy fermion compound CeB6 is probed by resonant inelastic soft X-ray scattering using photon energies across the Ce 3d and 4d absorption edges. The hybridization between the localized 4f orbitals and the delocalized valence-band states is studied by identifying the different spectral contributions from inelastic Ra...
Article
The electronic structure of CoO is studied by resonant inelastic soft X-ray scattering spectroscopy using photon energies across the Co 2p absorption edges. The different spectral contributions from the energy-loss structures are identified as Raman scattering due to d-d and charge-transfer excitations. For excitation energies close to the L3 reson...
Article
We report resonant inelastic x-ray scattering (RIXS) excited by circularly polarized x-rays on Mn-Zn ferrite at the Mn L2,3-resonances. We demonstrate that crystal field excitations, as expected for localized systems, dominate the RIXS spectra and thus their dichroic asymmetry cannot be interpreted in terms of spin-resolved partial density of state...
Article
The spin transition in LaCoO3 is investigated by temperature-dependent resonant soft X-ray emission spectroscopy near the Co 2p absorption edges. This element-specific technique is more bulk sensitive with respect to the temperature induced spin-state of the Co3+ ions in LaCoO3 than other high-energy spectroscopic methods. The spin transition is in...
Article
Amorphous Al(73)Zr(27) alloy film, grown and then subjected to heat treatments at 400 and 700 °C, was studied using a combination of x-ray diffraction and soft x-ray spectroscopic techniques. The Al L(2,3) and Al K x-ray absorption spectroscopy (XAS) and Al L(2,3) x-ray emission spectroscopy (XES) used allowed probing the unoccupied and occupied Al...
Article
Full-text available
The valence shell electron configurations within a few electron volts above the Fermi level in cerium, ytterbium, europium and samarium compounds were probed by resonant X-ray emission spectroscopy (RXES) at the L3 absorption pre-edge. The rare earth systems show distinct spectral signatures depending on the f-electron configuration. The high energ...
Article
Using a simplified model, we calculate resonant X-ray emission (RXE) spectra with Ce 2p to 5d excitation and Ce nl to 2p de-excitation for mixed valence Ce compounds, where nl is 3d or valence states. If the core–hole effect is large to play an important role in the Ce L3 XAS, the RXE spectral features for nl=3d and valence states are significantly...
Article
We investigated the structural stability and oxidation resistance of Zr–Al films upon annealing in air. The concentration of Zr was varied from 0 to 100at.%, with a step of 10at.%. The films were fabricated using ultra-high vacuum based magnetron sputtering. The as-deposited films with Zr content from 17.3at.% to 70.7at.% were found to be X-ray amo...
Chapter
Resonant inelastic X-ray scattering (RIXS) measurements at the actinide 5d threshold provide an opportunity to study elementary excitations in actinide systems in detail. It has turned out that the technique is very sensitive to the valency and the chemical state of actinide in contrast to X-ray absorption spectroscopy, being hampered by the substa...
Article
X-ray absorption and resonant X-ray emission measurements at the O 1s edge of the uranium oxides UO2, U3O8 and UO3 are presented. The spectral shapes of the O Kα X-ray emission spectra of UO3 exhibit significant excitation energy dependence, from an asymmetric to a symmetric form, which differs from those of UO2 and U3O8. This energy dependence is...
Article
Full-text available
The electronic structure of single-crystal PuO2 is studied using O 1s x-ray absorption (XA) and x-ray emission. Interpretation of the experimental data is supported by extensive first-principles calculations on the basis of the densityfunctionaltheory+U approach. The measured XA spectra show a significant difference in intensity for the first two p...
Article
Full-text available
A high energy resolution x-ray absorption near-edge structure (XANES) spectroscopy study on U4+ (UO2), U5+ ([UO2Py5][KI2Py2]), and U6+ [UO2(NO3)2(H2O)6] demonstrates the potential of this experimental technique for qualitative/semiqualitative and quantitative actinide speciation investigations. We observe a pre-edge feature with quadrupole nature i...
Article
After a few hundred years, the actinides will dominate the radiotoxicity of spent nuclear fuel. This does not necessarily mean that the actinides will dominate the dose to organisms at the surface above a geologic repository. Quite the contrary, in most performance assessments this dose is dominated by long-lived fission products, activation produc...
Article
Full-text available
We present a study of selenate (SeO42-) on an iron surface in ground water solution by X-ray absorption near-edge spectroscopy. Spectral sharpening is obtained by using the high energy resolution fluorescence detection technique that also efficiently suppresses the strong fluorescence signal from the Fe surface in the highly dilute samples (Se conc...
Article
We have used X-ray absorption (XA) and resonant inelastic X-ray scattering (RIXS) spectroscopies to study a series of copper compounds, namely Cu2O, CuO, Cu(OH)2, CuCl2, Cu2S, CuSO4, malachite (Cu2(CO3)2(OH)2) and atacamite (CuCl2·3Cu(OH)2). Cu 2p XA spectra provide information about oxidation states. Divalent copper gives a single narrow line due...
Article
Full-text available
An instrumental and experimental setup for soft x-ray spectroscopy meeting the requirements of a closed source for radioactivity is described. The system consists of a vacuum sealed cell containing the sample, mounted on a tubing system to ensure compatibility with most standard manipulators. The soft x rays penetrate a thin x-ray window separating...
Article
Soft x-ray emission spectroscopy was used to characterize the electronic structure of seven copper nitride films, one synthesized with atomic layer deposition (ALD) and six grown with chemical vapor deposition (CVD) at different preparation temperatures. Interpretation of the x-ray emission spectra was supported by calculations of the electronic st...
Article
This study illustrates how the damage from copper corrosion can be reduced by modifying the chemistry of the copper surface environment. The surface modification of oxidized copper films induced by chemical reaction with Cl− and HCO3- in aqueous solutions was monitored by in situ X-ray absorption spectroscopy. The results show that corrosion of cop...
Article
Full-text available
The possibilities for using x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS) to probe the Cu oxidation state and changes in the electronic structure during interaction between copper and ground-water solutions were examined. Surface modifications induced by chemical reactions of oxidized 100 Å Cu films with Cl−, SO...
Article
Full-text available
The charge state and local ordering of Mn doped into a pulsed laser deposited single-phase thin film of ZnO are investigated by using x-ray absorption spectroscopy at the O K-edge, Mn K-edge and L-edge, and x-ray emission spectroscopy at the O K-edge and Mn L-edge. This film is ferromagnetic at room temperature. EXAFS measurement shows that Mn2+ r...
Article
Full-text available
The measurements on radioactive actinide isotopes (curium-248) were performed using very small sample quantities (micrograms) to minimize the sample activity. Resonant inelastic x-ray scattering (RIXS) spectra of curium oxide at the Cm 5d edge were measured for the first time. RIXS data are compared with theoretical calculations using atomic multip...
Article
Full-text available
The occupied and unoccupied valence band states of MgB2 have been studied using high-resolution soft X-ray emission and soft X-ray absorption spectroscopies. In particular, the B 2p partial density of states was measured near the Fermi level. The states at the Fermi edge are identified by comparison to calculation as being of B 2pxy origin. Resonan...