Abstract
We investigated the excited states of a one-dimensional charge-transfer Mott insulator ${[\mathrm{NiBr}(\mathrm{chxn})}_{2}{]\mathrm{Br}}_{2}$ by femtosecond luminescence spectroscopy. In the picosecond region, we observed a luminescence component which is different from that observed under steady-state excitation. This picosecond luminescence has a large Stokes shift and a broad bandwidth, suggesting the existence of an excited state with large lattice relaxation in addition to the excited state with a small relaxation. The dynamical behavior of the luminescence has been qualitatively interpreted in terms of a model assuming two adiabatic potential-energy surfaces.
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