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Two‐Photon Resonance‐Enhanced Transients in Femtosecond Spectra of Molecular Aggregates
Author(s) -
Gaizauskas E.,
Feller K.H.
Publication year - 1997
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1997.tb03197.x
Subject(s) - femtosecond , delocalized electron , exciton , resonance (particle physics) , spectral line , photon , absorption (acoustics) , molecular physics , absorption spectroscopy , atomic physics , four wave mixing , chemistry , materials science , nonlinear optics , optics , physics , laser , condensed matter physics , quantum mechanics , organic chemistry
— Two‐photon resonance‐enhanced four‐wave mixing processes relevant to pump‐probe difference absorption measurements with femtosecond pulses in linear aggregates were analyzed theoretically. Transitions to two‐exciton bands were found to be contributing to coherent transients of the time‐resolved spectra around the zero delay time. This part of the signal provides in principle the possibility of direct measurement of the exciton delocalization length.