Optical constants of the fullerite single crystal

A complete set of fundamental optical functions is calculated for the fulle rite (C-60) single crystal in the range of 1.5-5.0 eV on the basis of the s pectra known for the real and imaginary parts of the dielectric constant. T he integrated spectrum of the dielectric constant is expanded in elementary components. For each component, three basic parameters (the energy of the peak, the half-width, and the oscillator strength) are determined. A scheme is proposed which describes the nature of these components on the basis of the presently available theoretical calculations of the fullerite bands.