Sökning: "RAY-ABSORPTION-SPECTRA"
Visar resultat 1 - 5 av 16 avhandlingar innehållade ordet RAY-ABSORPTION-SPECTRA.
1. Theory of X-ray Absorption Spectra and Spin Transfer Torque
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
2. Time-dependent molecular properties in the optical and x-ray regions
Sammanfattning : Time-dependent molecular properties are important for the experimental characterization of molecular materials. We show how these properties can be calculated, for optical and x-ray frequencies, using novel quantum chemical methods. LÄS MER
3. X-ray spectroscopy on diatomic and cationic molecules
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
4. Life of a Photon in X-ray Spectroscopy
Sammanfattning : This thesis summarizes the experimental work in which an ultrafastX-ray laser plasma source was combined with variousscalable direct detection schemes to test a novel approach forlab-based time-resolved X-ray absorption spectroscopy. A laserplasma source based on a water jet target was built and commissioned. LÄS MER
5. Theoretical Investigations of Selected Heavy Elements and Metal-hydrogen Systems by Means of Electronic Structure Calculations
Sammanfattning : Using ab initio electronic structure calculations based on density functional theory the crystal, electronic and magnetic structures of selected materials have been investigated. The materials which are the subjects of these investigations can be divided into two groups. LÄS MER
