The technique for establishing the optical characteristics of metal-lic systems from synchrotron reflection spectra allows one to establish characteristics for the required range of low energy values. It is pro-posed to use the procedure for evaluating the electronic properties of aluminum by experimentally investigating the spectrum of optical conductivity with subsequent calculation of the Kramers-Kronig inte-gral relations and the analytical between optical functions. For com-parison, the results of processing the spectrum of the optical conduc-tivity of an ellipsometric experiment are presented for a range of en-ergy values from 0.5 to 3 eV. A feature of the approach for determin-ing the electronic characteristics of metal systems by minimizing the deviation of the model optical conductivity curve from the experi-mental one is the variation in the effective mass of the electrons. When using ellipsometry data, the determined electronic characteris-tics change quite sequentially with a change in the effective mass val-ue. The use of data obtained from synchrotron spectra shows the presence of significant local jumps in the measured values at certain effective masses. Perhaps this is determined by the imperfection in the numerical approaches of interpreting the data of the synchrotron ex-periment. When modeling optical conductivity, we can summarize the contributions from interband conductivity under the influence of pho-ton energy. In the case of permittivity, cross-contributions should also be considered.
The research was carried out within the state assignment of FASO of Russia (theme № АААА-А19-119031890028-0)