Abstract
Photo-induced i.r. absorption measurements have been made on the bromo-bridged Ni 3+ complex ({Ni(chxn) 2Br}Br 2: chxn = cyclohexanediamine), which has the one-dimensional Mott-Hubbard-type ground state. A photo-induced absorption band was observed around 0.25 eV, at 1.3 eV. In the Mott-Hubbard system, this is the first observation of the gap state, which can be ascribed to the formation of small polarons accompanied by the displacements of the bridging bromine ions after photo-excitation of an electron-hole pair. This interpretation is supported by both the observed results of the laser-intensity dependence of the photo-induced signals and the quantum-yield spectra of photoconductivity.
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