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The optical properties and electronic structure of AlPO4, SiO2, Type I collagen, and DNA were examined to gain insight into the van der Waals-London dispersion behavior of these materials. Interband optical properties of AlPO4 and SiO2 were derived from vacuum ultraviolet spectroscopy and spectroscopic ellipsometry, and showed a strong dependence on the crystals' constituent tetrahedral units, with strong implications for the role of phosphate groups in biological materials. The UV-Vis decadicdoi:10.1557/opl.2014.301 fatcat:du44tz7t7jb2hgbxrm2msxvztm