Target Analysis Resolves the Ground and Excited State Properties from Femtosecond Stimulated Raman Spectra
Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Target analysis is employed to resolve the ground and excited state properties from simultaneously measured Femtosecond Stimulated Raman Spectra (FSRS) and Transient Absorption Spectra (TAS). FSRS is a three-pulse technique, involving picosecond Raman pump pulses and femtosecond visible pump and probe pulses. The TAS are needed to precisely estimate the properties of the Instrument Response Function. The prezero “coherent artifact” present during the overlap of the three pulses is described by a damped oscillation with a frequency (ω – ω n ) where ω n is a ground state resonance Raman frequency. Simultaneous target analysis of the FSRS and TAS allows the complete excited state dynamics to be resolved with a time resolution better than 100 fs. The model system studied is the carotenoid lycopene in tetrahydrofuran. The lycopene dynamics show a spectral evolution with seven states, including a biphasic cooling process during the S2–S1 internal conversion, multiple S1 lifetimes, and an S* state decaying with a lifetime of 7 ps.
Authors: Ivo H.M. van Stokkum, Joris J. Snellenburg, Petra Chrupková, Jakub Dostal, Sebastian Weigand, Jörn Weißenborn, John T.M. Kennis, Miroslav Kloz
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4402297893