Search for dissertations about: "RAY-ABSORPTION SPECTROSCOPY"

Showing result 1 - 5 of 159 swedish dissertations containing the words RAY-ABSORPTION SPECTROSCOPY.

  2. 1. Structure Modeling with X-ray Absorption and Reverse Monte Carlo: Applications to Water

    Author : Mikael Leetmaa; Lars G M Pettersson; John Rehr; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; water structure; x-ray absorption; spectroscopy; diffraction; reverse monte carlo; XAS; EXAFS; XANES; RMC; TP-DFT spectrum calculations; Physics; Fysik; kemisk fysik; Chemical Physics;

    Abstract : Water is an important substance. It is part of us, of our environment, and is a fundamental prerequisite for the existence of life as we know it. The structure of water is still, after over 100 years of research on the subject, however under debate. READ MORE

  4. 2. X-ray Absorption and Fragmentationas Initial Steps of Radiation Damage in Free Organic Molecules and Nanoparticles

    Author : Abdul Rahman Abid; Minna Patanen; Olle Björneholm; Juha Nikkinen; Laurent Nahon; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Coincidence spectroscopy; PEPI PI CO; electron spectroscopy; X-ray absorption spectroscopy; mass spectrometry; photodissociation; gas-phase; liquids; nanoparticles; charge transfer; synchrotron radiation; Fysik; Physics; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : Understanding the molecular radiation damage is crucial in radiobiology, molecular physics, and atmospheric science. In this thesis, the initial steps of radiation damage of anhydrous gas-phase molecules and hydrated nanoparticles were studied using synchrotron radiation based electron-ion coincidence spectroscopy and X-ray absorption spectroscopy under vacuum conditions. READ MORE

  5. 3. Photoelectron Spectroscopy of High Temperature Superconductors and Related Compounds

    Author : Henrik Nylén; Synkrotronljusfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; egenskaper elektriska; supraledare; magnetiska och optiska ; magnetisk resonans; X-ray Absorption; Photoelectron Spectroscopy; Resonant Photoemission; Condensed matter:electronic structure; High Temperature Superconductors; Angle Resolved Photoemission; electrical; supraconductors; magnetic and optical properties; magnetic resonance; spectroscopy; spektroskopi; Kondenserade materiens egenskaper:elektronstruktur; relaxation; Fysicumarkivet A:1998:Nylén;

    Abstract : In this thesis, the high temperature superconductors (HTSC) Ba0.6K0.4BiO3, La2CuO4+x, Bi2Sr2Ca1-xYxCu2O 8+d, Bi2Sr2CuO6+d as well as semiconducting Ba0.9K0. READ MORE

  6. 4. Theory of X-ray Absorption Spectra and Spin Transfer Torque

    Author : Ola Wessely; Olle Eriksson; Lars Nordström; Eric Shirley; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; First principles calculations; X-ray absorption spectroscopy; Carbon nanotubes; Helical spin density waves; Hydrogen storage; Spin transfer torque; Fysik; Physics; Fysik;

    Abstract : The subjects of the thesis are theoretical first principles calculations of X-ray absorption (XA) spectra and current induced spin transfer torque. XA spectra calculated from atomic multiplet theory and from band structure calculations, based on density functional theory for La0.7Sr0.3MnO3 have been compared to experiment. READ MORE

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

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

    Abstract : 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. READ MORE