Sökning: "electronic energy migration transfer"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden electronic energy migration transfer.

1. 1. Electronic Energy Migration/Transfer as a Tool to Explore Biomacromolecular Structures

   Författare :Therese Mikaelsson; Lennart B.-Å. Johansson; Kristine Kilså; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fluorescence; electronic energy transfer; two-photon excitation; small ribosomal protein S16; macromolecular crowding; dextran 20; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : Fluorescence-based techniques are widely used in bioscience, offering a high sensitivity and versatility. In this work, fluorescence electronic energy migration/ transfer is applied to measure intramolecular distances in two types of systems and under various conditions. LÄS MER

3. 2. Electronic Energy Transfer within Asymmetric Pairs of Fluorophores: Partial Donor-Donor Energy Migration (PDDEM)

   Författare :Stanislav Kalinin; Lennart B.-Å. Johansson; Helge Lemmetyinen; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; fluorescence resonance energy transfer FRET ; donor-donor energy migration DDEM ; homotransfer; fluorescence relaxation; lifetimes; time-resolved fluorescence anisotropy; time-correlated single photon counting; distance measurements; protein structure; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

   Sammanfattning : A kinetic model of electronic energy migration within pairs of photophysically non-identical fluorophores has been developed. The model applies to fluorescent groups that exhibit different photophysical and spectral properties when attached to different positions in a macromolecule. LÄS MER

4. 3. Energy migration and charge formation in conjugated polymers

   Författare :Yuri Zaushitsyn; Kemisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic resonance; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; magnetiska och optiska ; supraledare; magnetisk resonans; spektroskopi; supraconductors; magnetic and optical properties; electrical; energy transfer; Physics; Fysik; Condensed matter:electronic structure; transient absorption spectroscopy; conjugated polymer; charge photogeneration;

   Sammanfattning : The main part of the thesis is concerned with charge photogeneration in conjugated polymers. MeLPPP and POMeOPT films were investigated by transient absorption spectroscopy using different excitation photon energies and light intensities with and without an external electric field. LÄS MER

5. 4. A new approach to the analyses of fluorescence depolarisation experiments in the presence of electronic energy transport

   Författare :Oleg Opanasyuk; Lennart B-Å Johansson; Per-Olof Westlund; Yehudi Levine; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; electronic energy transfer; donor-donor energy migration; extended Förster theory; fluorescence depolarisation; two-photon excitation; computer simulations; genetic algorithms; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : A new and general procedure is described for a detailed analysis of time-resolved fluorescence depolarisation data in the presence of electronic energy migration. An isotropic ensemble of bifluorophoric molecules (D1-R-D2) has been studied to demonstrate its utility. LÄS MER

7. 5. Extended Förster Theory of Electronic Energy Transport within Pairs of Reorienting Chromophoric Molecules

   Författare :Nils Norlin; Lennart B.-Å. Johansson; Yehudi K. Levine; Umeå universitet; []
   Nyckelord :electronic energy migration transfer; extended Förster theory; orientation factor; DDEM; PDDEM; time-resolved fluorescence anisotropy; time-correlated single photon counting; Brownian dynamics; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : An extended Förster theory (EFT), previously derived (L. B.-Å. Johansson et al. LÄS MER