Optical Properties Of Coals And Graphite PDF Download

A search for literature reporting the optical properties of carbon in any spectral region provided experimental data from which the extinction-coefficient for crystalline graphite could be determined in the 0.001 eV to 1.0 meV region. By use of high and low energy approximations the extinction-coefficient spectrum thus obtained was defined piecewise analytically over the entire spectral region. Kramers-Kronig analysis of the extinction-coefficient spectrum then gave spectral values of the real refractive index, which along with the extinction-coefficient made it possible to calculate the complex dielectric constant, the energy loss function and the reflectance at normal incidence. Analytical methods were used in all integrations of the Kramers-Kronig analysis and sum rules. Five sum rules were evaluated showing the high quality of the resultant data. These data are presented in graphical and tabular form.