Ultrafast linear and non-linear spectroscopy : from biological light-receptors to artificial light-harvesting systems

In the experiments presented in this work, linear and non-linear femtosecond time-resolved spectrsocopy were applied to investigate the structure-function and functiondynamics relationship in biological and artificially designed systems. The experiments presented in this work utilize femtosecond time-resolved transient absorption and transient grating as well as picosecond time-resolved fluorescence spectroscopy to investigate the photophysics and photochemistry of biological photoreceptors and address the light-induced excited-state processes in a particular molecular device that serves as a - structurally - very simple light-harvesting antenna and potentially as a catalysis-switch for the production of hydrogen in solution. The combination of white-light probe transient absorption and coherent transient grating spectroscopies yields spectral information about the excited state absorption in concert with high quality, high signal-to-noise kinetic transients, which allow for precise fitting and therefore very accurate time-constants to be extracted from the data. The use of femtosecond time-resolved transient grating spectroscopy is relatively uncommon in addressing questions concerning the excited-state reaction pathways of complex (biological) systems, and therefore the experiments presented in this work constitute according to the literature the first studies applying this technique to a a metalloporphyrin and an artificial light-harvesting antenna.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Würzburg

Year

2005

Author dc:creator

• Dietzek, Benjamin

Contributors dc:contributor

• Kiefer, Wolfgang

• Femtosekunden zeitaufgelöste Spektroskopie
• biologische Photorezeptoren
• Übergangsmetallkomplexe
• künstliche Lichtsammelsysteme
• femtosecond time-resolved spectroscopy
• biological photoreceptors
• transition metal complexes
• artificial light harvesting systems

Repository record source_url

https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/1337

OAI identifier oai:identifier

oai:opus.bibliothek.uni-wuerzburg.de:1337