Sökning: "time-correlated single photon counting"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden time-correlated single photon counting.

1. 1. Two-Photon Excited Fluorescence Depolarisation : Experimental and Theoretical Development

   Författare :Linus Ryderfors; Emad Mukhtar; Lennart B.-Å. Johansson; Yehudi K. Levine; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Two-photon excitation; Fluorescence; Fluorescence depolarisation; Fluorescence anisotropy; Time-correlated single photon counting; Gold nanoparticles; Rotational diffusion; Excited state symmetry; Extended Förster theory; Orientation correlation functions; Donor-donor energy migration DDEM ; Chemical physics; Kemisk fysik;

   Sammanfattning : We have studied fundamental aspects of time-resolved two-photon excited fluorescence depolarisation. The thesis presents experimental as well as theoretical progress. 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. 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

5. 4. Single-­molecule spectroscopy of π-­conjugated polymers

   Författare :Oleg Mirzov; Kemisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluorescence lifetime; low temperature; spectral diffusion; blinking; MEH-PPV; Single-molecule spectroscopy; π-conjugated polymers; 2D polarization; Monte Carlo; energy transfer;

   Sammanfattning : When applied to condensed-matter samples of large organic molecules, optical spectroscopy faces the problem of inhomogeneous broadening caused by the diversity of environments and conformations that sample molecules are subjected to. This severely limits the information that can be extracted from optical spectra. LÄS MER

7. 5. Fluorescence Properties of Quantum Dots and Their Utilization in Bioimaging

   Författare :Hao Xu; Ying Fu; Hjalmar Brismar; Marina Zelenina; Mattias Goksör; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fluorescence; Microscopy; Bioimaging; Nanomaterial; cytotoxicity; mechanism; Biological Physics; Biologisk fysik;

   Sammanfattning : Quantum dots (QDs), especially colloidal semiconductor QDs, possess properties including high quantum yields, narrow fluorescence spectra, broad absorption and excellent photostability, making them extremely powerful in bioimaging. In this thesis, we studied the fluorescence properties of QDs and attempted multiple ways to boost applications of QDs in bioimaging field. LÄS MER