Sökning: "X-ray-Absorption"

Visar resultat 1 - 5 av 192 avhandlingar innehållade ordet X-ray-Absorption.

  1. 1. X-ray absorption near the edge

    Författare :Oleksandr Plashkevych; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 2. Theory of X-ray Absorption Spectra and Spin Transfer Torque

    Författare :Ola Wessely; Olle Eriksson; Lars Nordström; Eric Shirley; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

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

    Författare :Mikael Leetmaa; Lars G M Pettersson; John Rehr; Stockholms universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  5. 4. Probing unoccupied electronic states in aqueous solutions

    Författare :Lars-Åke Näslund; Anders Nilsson; Hendrik Bluhm; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; x-ray absorption; x-ray absorption spectroscopy; XAS; NEXAFS; water; liquid water; aqueous solution; hydrogen bond; hydrogen bond network; local geometry; Physics; Fysik;

    Sammanfattning : Water is one of the most common compounds on earth and is essential for all biological activities. Water has, however, been a mystery for many years due to the large number of unusual chemical and physical properties, e.g. decreased volume during melting and maximum density at 4 °C. LÄS MER

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

    Författare :Abdul Rahman Abid; Minna Patanen; Olle Björneholm; Juha Nikkinen; Laurent Nahon; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER