Search for dissertations about: "disorder broadening"

Showing result 1 - 5 of 9 swedish dissertations containing the words disorder broadening.

2. 1. Influence of Global Composition and Local Environment on the Spectroscopic and Magnetic Properties of Metallic Alloys

   Author : Weine Olovsson; Igor A. Abrikosov; G. Malcolm Stocks; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; core level shift; random alloy; first principles simulations; density functional theory; auger kinetic energy; Invar alloys; exchange parameter; classical Heisenberg Hamiltonian; complete screening; transition state; disorder broadening; Fysik; Physics; Fysik;

   Abstract : Theoretical investigations of spectroscopic and magnetic properties of metallic systems in the bulk, as well as in nanostructured materials, have been performed within the density functional theory. The major part of the present work studies the differences between binding energies of electrons tightly bound to the atoms, the so-called core electrons (in contrast with the valence electrons), that is, core-level binding energy shift (CLS). READ MORE

4. 2. Formation and Dynamics of Molecular Excitons and their Fingerprints in Nonlinear Optical Spectroscopy

   Author : Pär Kjellberg; Kemisk fysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; supraledare; magnetisk resonans; spektroskopi; Physical chemistry; Fysikalisk kemi; Photochemistry; Fotokemi; Kondenserade materiens egenskaper:elektronstruktur; magnetiska och optiska ; egenskaper elektriska; supraconductors; magnetic resonance; relaxation; spectroscopy; Fysik; Chemistry; Kemi; Condensed matter:electronic structure; electrical; Physics; Redfield relaxation theory ; Inhomogeneous broadening ; Time-dependent density functional theory ; Conjugated polymers ; Three-pulse photon echo ; Molecular excitons ; magnetic and optical properties; Nonlinear spectroscopy ;

   Abstract : An efficient transfer of energy in molecular systems has proven to be of fundamental importance both in nature and industrial applications. The ability of molecules to work together forming collective excitations, so-called excitons, plays a key role in for example the extraordinary fast energy transfer involved in the first steps of photosynthesis. READ MORE

5. 3. Novel treatment approaches for children and adolescents with obsessive-compulsive disorder

   Author : Kristina Aspvall; Karolinska Institutet; Karolinska Institutet; []
   Keywords : ;

   Abstract : Background: Obsessive-compulsive disorder (OCD) is a prevalent and disabling condition with typical onset during childhood. The recommended treatment is cognitive behavioral therapy (CBT), but it is seldom available to young people. READ MORE

6. 4. Effects of Energetic Disorder on the Optoelectronic Properties of Organic Solar Cells

   Author : Nikolaos Felekidis; Martijn Kemerink; Olle Inganäs; Carsten Deibel; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Organic photovoltaics (OPVs) is a promising low-cost and environmental-friendly technology currently achieving 12-14% power conversion efficiency. Despite the extensive focus of the research community over the last years, critical mechanisms defining the performance of OPVs are still topics of debate. READ MORE

7. 5. Theoretical Considerations of Local Environment Effects in Alloys

   Author : Tobias Marten; Igor Abrikosov; Josef Kudrnovský; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Condensed matter physics; Kondenserade materiens fysik;

   Abstract : This thesis is devoted to a theoretical study of local environment effects in alloys. A fundamental property of a disordered system is that all chemically equivalent atoms are different due to their different chemical environments, in contrast to an ideal periodic solid where all the atoms that occupy equivalent positions in the crystal have exactly the same physical properties. READ MORE