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Visar resultat 21 - 25 av 79 avhandlingar som matchar ovanstående sökkriterier.

1. 21. X-ray spectroscopy on diatomic and cationic molecules

   Författare :Ludvig Kjellsson; Jan-Erik Rubensson; Marcus Agåker; Monica Turcato; Michael Meyer; John Bozek; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; X-ray absorption spectroscopy; resonant inelastic X-ray scattering; cationic molecule; dinitrogen; dioxygen; carbon monoxide; aqueous hydroxyl radical; lifetime-vibrational interference; RIXS; XAS; LVI; N2; O2; CO; H2O; OH;

   Sammanfattning : X-ray spectroscopy have been used to study the electronic structure of diatomic and cationic molecules. X-ray absorption spectra of the molecular cations N2+, O2+, and CO+ have been measured. LÄS MER

3. 22. New Materials for Spintronics : Electronic structure and magnetism

   Författare :Ronny Knut; Olof Karis; Biplab Sanyal; Hermann Durr; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spintronics; X-ray photoemission; XPS; XMCD; XAS; magnetic semiconductors; HIKE; HAXPES; multilayer; monte carlo; magnetism; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : Materials exhibiting new functionalities due to interdependent electric (e.g. conductivity) and magnetic properties are potentially interesting for spintronics applications. LÄS MER

4. 23. Theoretical modeling of x-ray and vibrational spectroscopies applied to liquid water and surface adsorbates

   Författare :Mathias P. Ljungberg; Lars Pettersson; Shaul Mukamel; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; water; XAS; XES; IR; Raman; Chemical physics; Kemisk fysik; kemisk fysik; Chemical Physics;

   Sammanfattning : This thesis presents results of theoretical modeling of x-ray and vibrational spectroscopies applied to liquid water and to CO adsorbed on a Ni(100) surface. The Reverse Monte Carlo method is used to search for  water structures that reproduce diffraction, IR/Raman and x-ray absorption by fitting them to experimental data and imposed constraints. LÄS MER

5. 24. Operando X-ray Absorption Spectroscopy Studies of Methane Oxidation Catalysts

   Författare :Johan Nilsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; operando spectroscopy; XAS; palladium; heterogeneous catalysis; methane oxidation; XAFS;

   Sammanfattning : Operando spectroscopy is an experimental method in catalysis that combines measurements of catalytic activity and selectivity with simultaneous in situ spectroscopic characterization of the catalyst. Since the structure and composition of the catalyst are probed under reaction conditions, the method can provide valuable information to elucidate the mechanism of the studied reaction. LÄS MER

7. 25. Palladium Catalysis in Directed C-H Bond Activation and Cycloisomerisation Reactions

   Författare :Michael Oschmann; Jan-Erling Bäckvall; Oscar Verho; Jose Luis Mascareñas; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palladium II ; Catalysis; C-H Functionalisation; Transamidation; XAS; organisk kemi; Organic Chemistry;

   Sammanfattning : The main focus of this thesis concerns the development of Pd(II)-catalysed synthetic methodologies for the preparation of biologically active compounds.In the first part (paper I-III), unactivated C–H bonds of a cyclobutane derivative are selectively functionalised using a directing group starting from the feedstock compound verbenone (paper I). LÄS MER