Pump—probe spectroscopy and exciton dynamics of J aggregates at high pump intensities

We have measured the picosecond pump—probe spectra of BIC J aggregates using a spectral continuum for the probe. The excitation pulses were intense (10 15−2×10 16 photons/cm 2) and created many excitons per aggregate. The observed dynamics are intensity dependent and reflect exciton—exciton annihila...

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Bibliographic Details
Published in:Chemical physics letters 1993-08, Vol.211 (6), p.511-515
Main Authors: Johnson, Alan E., Kumazaki, Shigeichi, Yoshihara, Keitaro
Format: Article
Language:English
Subjects:
Atomic and molecular clusters
Atomic and molecular physics
Exact sciences and technology
Physics
Studies of special atoms, molecules and their ions
clusters
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Summary:We have measured the picosecond pump—probe spectra of BIC J aggregates using a spectral continuum for the probe. The excitation pulses were intense (10 15−2×10 16 photons/cm 2) and created many excitons per aggregate. The observed dynamics are intensity dependent and reflect exciton—exciton annihilation processes. In addition, the zero-time spectrum is also intensity dependent, probably due to a reduction of k space at high exciton concentrations.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)80135-C