Evidence of the dynamic disordering effects in PIC Cl J-aggregates from picosecond spectroscopy Original Research Article

We employ a pump–probe approach to strongly excited molecular aggregates to study disordering processes. The experimental data obtained for PIC Cl J-aggregates at room temperature are discussed on the basis of the theory, which takes into account the effect of dynamic disordering in one-dimensional molecular systems. Experimentally measured features of the spectral position and magnitude of the difference absorption spectra are shown as appeared due to `hotʹ processes of off-diagonal disordering of an excited aggregate after the annihilation event.