Influence of pi-stacking on the resonant enhancement of the second-order nonlinear optical response of dipolar chromophores

Article Abstract:

The use of second-harmonic generation at different wavelengths to compare the resonant contributions of two simple dipolar chromophores, nitroaniline and nitrosulfenamide is reported. The result shows that pi intermolecular interaction does result in excitations that are observable in the linear spectrum of nitroaniline and thus could have an influence on the nonlinear response.

Wavelet analysis

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Excitation energy transfer between closely spaced multichromophoric systems: Effect of band mixing and intraband relaxation

Article Abstract:

The excitation energy transfer between two closely spaced linear molecular J-aggregates, whose excited states are Frenkel excitons are theoretically analyzed. Results suggested that the best way of determining this transfer rate between two J-aggregates is to measure the fluorescence kinetics of the acceptor J-band after excitation of the donor J-band.

Energy transformation

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Picosecond protein response to the chromophore isomerization of photoactive yellow protein: Selective observation of tyrosine and tryptophan residues by time-resolved ultraviolet resonance Raman Spectroscopy

Article Abstract:

The measurement of picosecond time-resolved ultraviolet resonance Raman (UVRR) spectra of photoactive yellow protein (PYP) reveal that spectral changes in bands of the tyrosine residue revealed that the hydrogen bond between Y42 and the chromophore becomes strong in the pG* state.

Isomerization, Raman spectroscopy

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