Results 71 to 80 of about 4,600 (221)

Magnetic susceptibility, EPR, NEXAFS and XPS spectra of Fe-doped CaBi2Nb2O9

Journal of Materials Research and Technology, 2020
In order to study the electronic state of Fe atoms and interatomic exchange interactions in solid solutions of Bi2CaNb2−2xFe2xO9−δ with perovskite structure, methods of magnetic dilution, NEXAFS, XPS and EPR spectroscopy were used.
N.A. Zhuk, V.P. Lutoev, B.A. Makeev, S.V. Nekipelov, A.V. Koroleva, A.V. Fedorova, M.V. Yermolina, D.S. Beznosikov, L.O. Karlova   +8 more
doaj   +1 more source

Photochemistry of Aromatic N‐Oxides in Water Probed by Time‐Resolved X‐ray Absorption Spectroscopy

Chemistry – A European Journal, EarlyView.
Time‐resolved XAS at the nitrogen and oxygen K‐edges is applied to the photorearrangement of two N‐oxides in water. Pyridine N‐oxide rapidly forms the oxaziridine isomer. Pyridazine N‐oxide undergoes ring opening to the diazo compound, without any evidence of intermediates.
Maximilian Paradiz Domínguez, Robby Büchner, Mattis Fondell, Albert M. Brouwer   +3 more
wiley   +1 more source

Nanoscale spectroscopy with polarized X-rays by NEXAFS-TXM

, 2011
International audienceNear-edge X-ray absorption spectroscopy (NEXAFS)1 is an essential analytical tool in material science. Combining NEXAFS with scanning transmission X-ray microscopy (STXM) adds spatial resolution and the possibility to study ...
Bittencourt, Carla, Gerd Schneider, Stefan Rehbein, Rehbein, S., Rehbein, Stefan, Schneider, G., Umek, Polona, Ke, X., Ewels, C.P., Guttmann, Peter, Peter Guttmann, Polona Umek, Carla Bittencourt, van Tendeloo, Gustaaf, Umek, P., Gustaaf Van Tendeloo, Ewels, Chris P., Xiaoxing Ke, Ke, Xiaoxing, Van Tendeloo, G., Chris P. Ewels, Bittencourt, C., Ewels, Christopher, Guttmann, P., Schneider, Gerd   +24 more
core   +1 more source

How Amino Acids Intercalate in CaFe Layered Double Hydroxides: A Combined RIXS and NEXAFS Study

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
Intercalation of amino acids in layered double hydroxides offers a road to functional (bio)catalysts. With resonant soft x‐ray spectroscopy we probe the electronic structure of these systems and observe activation and passivation of electronic states as well as bond formation between the amino acid and the LDH upon intercalation.
R. Büchner, A. Born, K. Ruotsalainen, R. Decker, A. Pietzsch   +4 more
wiley   +1 more source

An all‐polymer blend for photovoltaic applications: A combined photoabsorption, photoemission and ab initio multi‐configurational study

Polymer International, EarlyView.
Near‐edge X‐ray absorption fine structure, X‐ray photoelectron spectroscopy and multi‐configuration self‐consistent field results show, respectively, preferential edge‐on and face‐on orientations for the thiophene and naphthalene diimide units of the PBDB‐T‐SF:P(NDI2OD‐T2) all‐polymer blend, and surface accumulation of the acceptor.
Cássia Ferreira Coutinho Pereira, Luís Felipe de Lima Pimentel, Alexandre B. Rocha, Maria Luiza M. Rocco   +3 more
wiley   +1 more source

Polysaccharides, Proteins, and Phytoplankton Fragments: Four Chemically Distinct Types of Marine Primary Organic Aerosol Classified by Single Particle Spectromicroscopy

Advances in Meteorology, 2010
Carbon-containing aerosol particles collected in the Arctic and southeastern Pacific marine boundary layers show distinct chemical signatures of proteins, calcareous phytoplankton, and two types of polysaccharides in Near-Edge Absorption X-ray Fine ...
Lelia N. Hawkins, Lynn M. Russell
doaj   +1 more source

NEXAFS investigation of the condensed silane structure(SiH4凝聚态结构的近边X射线吸收精细结构研究)

Zhejiang Daxue xuebao. Lixue ban, 2001
用多重散射团簇方法对低温下凝聚态SiH4进行了Si的1 s NEXAFS理论研究，对不同的模型研究表明，此时凝聚相SiH4形成链状结构.
HEJiang-ping(何江平), TANGJing-chang(唐景昌)   +1 more
doaj   +1 more source

Structure formation in organic thin films observed in real time by energy dispersive near-edge x-ray absorption fine-structure spectroscopy

New Journal of Physics, 2013
We study the structure formation of 1,4,5,8-naphthalene-tetracarboxylicacid-dianhydride (NTCDA) multilayer films on Ag(111) surfaces by energy dispersive near-edge x-ray absorption fine-structure spectroscopy (NEXAFS) and photoelectron spectroscopy.
M Scholz, C Sauer, M Wiessner, N Nguyen, A Schöll, F Reinert   +5 more
doaj   +1 more source

Automated Identification of Thermal Transitions in Conjugated Material Thin Films Using In Situ Optical Spectroscopy

Small Methods, EarlyView.
This study demonstrates the effectiveness of in situ UV−vis coupled with automated data analysis, namely, ATLAS, for fast and reliable identification of multiple thermal transition in conjugated polymer thin films. This ATLAS method will significantly accelerate the understanding of the phase behavior of D‐A polymers with important implications for ...
Doan Vu, Martyn Jevric, Alireza Samadani, Mats R. Andersson, Christopher R. McNeill, Brendan T. O'Connor, Harald Ade   +6 more
wiley   +1 more source

Chemical Speciation by NEXAFS Spectromicroscopy: Insights from Molecular Modelling of Polymers

, 1996
Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy of polymers performed in a scanning transmission X-ray microscope (STXM) can provide chemical speciation with <0.1 gm spatial resolution in imaging mode.
S. G. Urquhart, E. G. Rightor, A. P. Smith, H. Ade, A. P. Hitchcock   +4 more
core   +1 more source