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Visar resultat 1 - 5 av 248 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Photo-induced dark states influorescence spectroscopy – investigations & applications

   Författare :Andriy Chmyrov; Jerker Widengren; Johan Hofkens; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluorescence correlation spectroscopy; triplet state; isomerisation; photobleaching; quenching; diffusion; total internal reflection; interface; Spectroscopy; Spektroskopi;

   Sammanfattning : This thesis focuses on investigations of transient dark states of fluorescentmolecules using spectroscopic techniques. The main purpose is to show andconvince the reader that transient dark states are not always a nuisance, butalso represent an additional source of information. LÄS MER

3. 2. Static and Dynamic Correlation Effects in Atoms

   Författare :Nils-Erik Dahlen; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic and optical properties; electrical; Condensed matter:electronic structure; relaxation; magnetic resonance; supraconductors; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; Atom- och molekylärfysik; Atomic and molecular physics; spektroskopi; magnetisk resonans; egenskaper elektriska; supraledare; magnetiska och optiska ; variational energies; double ionization; Electron correlation; laser-atom interaction; Fysicumarkivet A:2002:Dahlen; conserving approximations; Green s functions; GW-approximation;

   Sammanfattning : The thesis considers the effects of electron correlation by studying the two opposite limits of atoms in the ground state and atoms in strong laser pulses. Computational methods and theoretical approaches differ significantly due to the different physical processes that are studied in these two cases. LÄS MER

4. 3. Temporal Modulation in Fluorescence Spectroscopy and Imaging for Biological Applications

   Författare :Gustav Persson; Jerker Widengren; Jörg Enderlein; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluorescence; spectroscopy; microscopy; modulated excitation; intensity modulation; fluorescence correlation spectroscopy; transient states; molecular kinetics; Physics; Fysik;

   Sammanfattning : This thesis explores the benefits of intensity modulation for the purpose of extending the range of applications of fluorescence spectroscopy and imaging in cellular and molecular biology and medicine. Long-lived transient states of fluorescent molecules can, because of their long lifetimes, be used to detect subtle changes in the microenvironment of the molecule. LÄS MER

5. 4. Photoelectron Spectroscopy of High Temperature Superconductors and Related Compounds

   Författare :Henrik Nylén; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; egenskaper elektriska; supraledare; magnetiska och optiska ; magnetisk resonans; X-ray Absorption; Photoelectron Spectroscopy; Resonant Photoemission; Condensed matter:electronic structure; High Temperature Superconductors; Angle Resolved Photoemission; electrical; supraconductors; magnetic and optical properties; magnetic resonance; spectroscopy; spektroskopi; Kondenserade materiens egenskaper:elektronstruktur; relaxation; Fysicumarkivet A:1998:Nylén;

   Sammanfattning : In this thesis, the high temperature superconductors (HTSC) Ba0.6K0.4BiO3, La2CuO4+x, Bi2Sr2Ca1-xYxCu2O 8+d, Bi2Sr2CuO6+d as well as semiconducting Ba0.9K0. LÄS MER

7. 5. Correlation spectroscopy of single emitters : fundamental studies and applications

   Författare :Hans Blom; KTH; []
   Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : Correlation analysis and correlation spectroscopy has eversince the first developments, to characterise light emittingprocesses and biomolecular dynamics, continued to extend itspractical applicability. Today, correlation spectroscopy can beused in life science to study dynamical processes even at thesingle molecule level. LÄS MER