Abstract
The absorption spectrum of PbSiO 3, obtained by transmission through thin films, can be interpreted in terms of the optical basicity model to yield a basicity moderating parameter for Pb 2+ of 1.05. This agrees well with the value (approximately 1.0) obtained from recently reported “refraction basicity” measurements on the PbOSiO 2 system. The results are used to interpret the UV transmission spectrum of PbO which indicates essentially two (overlapping) major adsorption bands. The enegies of these bands are shown to be consistent with their origin as the 1 S 0 → 3 P 1 and 1 S 0 → 1 P 1 transitions of the Pb 2+ ion.
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