THE NATURAL ABSORPTION OF AQUAPHILOUS CRYSTAL SEMICONDUCTORS
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Date
1994
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Publisher
Ohio State University
Abstract
Earlier it was shown for the fundamental absorption edge of polar crystals to be in close agreement with the absorption discontinuity of limiting dulute solutions of the crystals. In this connection the united one oscillator model was proposed for the description electronic characteristics both crystals and their solutions. In development of these ideas the bioscillator model is calculated for the natural absorption of the crystal semiconductors. The first electron oscillator equation and the second electron oscillator equation are examined for the direct transition of the valence electrons and the indirect transition on the conduction electrons correspondingly taking account of the oscillator system connectedness determined experimentally from absorption spectra of the dulute solution crystals. The procedure and the equations are presented for the computations of the absorption integrals of the condensed medium and gases, the plasma, natural, effective, restricted band and dissipated energy for direct and indirect electron transitions in crystals accordingly from the natural absorption spectra of their solutions at the infinite dilution corrected for the state change energy. It is submited the function of electronic losses and effective number for crystals computed by reflectance spectrum. The theoretical formulations are in agreement with investigated dispersion on optical constants of polar crystal solutions near the absorption edge. In going from crystal to the solution with reducting electronic short-wave maximum of the fundamental absorption generated by direct transitions and long-wave maximum, generated by electron phonon interaction displace in the region of a lesser wavelength, decrease and disappears in the ratio of electronic densities correspondingly amounted to 1000. The proposed approach is directed to the use molecular spectrum data for the formation and characterisation of low-dimensional structures.
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Author Institution: Lomonosov State University of Moscow