Sökning: "electron charge transfer"

Visar resultat 16 - 20 av 190 avhandlingar innehållade orden electron charge transfer.

  1. 16. Extending Photoinduced Charge Separation. Molecular-semiconductor assemblies for solar energy conversion

    Författare :Valeria Saavedra; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Artificial photosynthesis; Back-electron transfer; Ruthenium complexes.; Dye-sensitized; Charge recombination; Charge separation; Conduction band mediated;

    Sammanfattning : The conversion of solar energy into chemical energy by harvesting visible-light with synthetic molecules presents several scientific and technological challenges. This thesis is dedicated to the investigation of approaches to long-lived charge separation, one of the crucial aspects for the photochemical generation of solar fuels. LÄS MER

  3. 17. Photoinduced Electron Transfer in Luminescent Lanthanide Complexes

    Författare :Daniel Kovacs; Eszter Borbas; Stephen Faulkner; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lanthanide; Luminescence; Photoinduced electron transfer; Kemi; Chemistry;

    Sammanfattning : Luminescence from the trivalent lanthanides is used for detection in biological systems. Lanthanide luminescence is usually sensitized by a light-harvesting organic chromophore (’antenna’). An ideal emitter has an antenna that efficiently transfers energy to the lanthanide, and a ligand that shields the metal from quenching solvent molecules. LÄS MER

  4. 18. Electron-lattice dynamics in π-conjugated systems

    Författare :Magnus Hultell (Andersson); Sven Stafström; Alessandro Troisi; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; charge transport; electron-lattice dynamics; polaron; adiabatic transport; electron localization; internal conversion; Computational physics; Beräkningsfysik;

    Sammanfattning : The work presented in this thesis concerns the dynamics in π-conjugated hydrocarbon systems. Due to the molecular bonding structure of these systems there exists a coupling between the electronic system and the phonons of the lattice. LÄS MER

  5. 19. Dynamics of Excitation Transfer and Charge Separation in Polymeric Semiconductors

    Författare :Arvydas Ruseckas; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Anisotropy; Photoinduced absorption; Femtosecond spectroscopy; Polythiophene; Conjugated polymers; Donor-Acceptor Complexes; Carbazole; Charge separation; Excitation transfer; Recombination; Physics; Fysik;

    Sammanfattning : Dynamics of optically excited electronic states have been studied in solid films and solutions of semiconducting polymers and model compounds. Transient absorption, monitored in the spectral range from 0.9 eV to 2.5 eV with a time resolution of about 100 fs, was the main experimental technique. LÄS MER

  7. 20. Regulation of proton-coupled electron transfer in cytochrome c oxidase : The role of membrane potential, proton pathways and ATP

    Författare :Markus Björck; Peter Brzezinski; Thorsten Friedrich; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cytochrome c oxidase; charge transfer; membrane potential; membrane protein; mitochondria; ATP; proton pump; Biochemistry; biokemi;

    Sammanfattning : Cytochrome c oxidase (CytcO) is the final electron acceptor of the respiratory chain. In this chain a current of electrons, derived from degradation of nutrients, along with protons, are used to reduce oxygen to water. The reaction is exergonic and the excess energy is used to pump protons across the membrane. LÄS MER