6533b829fe1ef96bd128a277
RESEARCH PRODUCT
Dynamics of ground and excited state chlorophylla molecules in pyridine solution probed by femtosecond transient absorption spectroscopy
Eva ÅKessonPaavo H. HynninenJari A. I. OksanenMarcus HilgendorffPeter MartinssonVilly Sundströmsubject
ChemistrySolvationGeneral Physics and Astronomy02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesExcited stateUltrafast laser spectroscopyFemtosecondPhysical and Theoretical ChemistryAtomic physics0210 nano-technologySpectroscopyAnisotropyUltrashort pulseExcitationdescription
Abstract Femtosecond pump–probe spectroscopy was used to investigate the ground and excited state dynamics of chlorophyll a (Chl a ) in pyridine following excitation by a 100 fs optical pulse. The transient absorption spectrum and kinetics reveal spectral evolution on two ultrafast time scales: ∼100 fs and ∼3 ps. We attribute these dynamics to ground-state transient hole-burning and solvation dynamics. Transient absorption anisotropy at early times (∼500 fs) was measured for Chl a in pyridine and shows a pronounced wavelength dependence, where anisotropy varies between 0 and 0.5. Strong contribution from excited state absorption is the origin of the variation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-08-01 | Chemical Physics Letters |