Target Analysis Resolves the Ground and Excited State Properties from Femtosecond Stimulated Raman Spectra.

ABSTRACT: 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.

SUBMITTER: van Stokkum IHM 

PROVIDER: S-EPMC11417988 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature