Optical spectroscopy of localized states in metallic oxides

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We investigate the possibility of direct observation of double electron local sites (LS) with strong correlation via single photon optical injection into LS states from band electron states (BE). Hybridization of LS and BE states results in existence of two peaks in the spectrum of optical absorption corresponding to single and double electron transitions. The peak positions and intensities reflect the value and sign of the correlation energy in localized electron states, and the line shape strongly depends on charge doping in the system. The doping dependence might provide a means of identifying two-electron, local-pair centers in the metallic oxides. A qualitative comparison with optical absorption experiments is made.