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

✍ Scribed by Alan E. Johnson; Shigeichi Kumazaki; Keitaro Yoshihara

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
482 KB
Volume
211
Category
Article
ISSN
0009-2614

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✦ Synopsis

We have measured the picosecond pump-probe spectra of BIC J aggregates using a spectral continuum for the probe. The excitation pulses were intense ( 10L5-2 x lOI photons/cm*) 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.

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