Optical Bloch equations for light harvesting complexes: pump probe spectra and saturation dynamics at high light intensity excitation

This work presents the derivation of optical Bloch equations using the the correlation expansion method. The application of these equations for high-pulse intensities is illustrated by focusing on the pump-pulse spectra and the fluorescence quantum yield. Hence, the microscopic founded Bloch equations can be used for the description of high intensity optical experiments on light harvesting complex of photosystem II (LHC II). Results show that a reasonable agreement is attained between experimental and calculated data. Furthermore, results reveal that the Pauli blocking effects are the dominant process responsible for the observed optical behavior at high intensities.