Optical properties and London dispersion interaction of
PHYSICAL REVIEW B 72, 205117 ͑2005͒ Optical properties and London dispersion interaction of amorphous and crystalline SiO2 determined by vacuum ultraviolet spectroscopy and spectroscopic ellipsometry G. L. Tan,1 M. F. Lemon,2 D. J. Jones,2 and R. H. French1,2,* 1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104,