With the formation of rare earth oxide cluster and nanoparticle, it's optical spectral and cross-section are typcially differ with bulk material, do quatum chemistry could provide help for this problem.
Yes. Quantum Chemistry do help to a great extent. Optical properties can be estimated by UV Vis spectrophotometers by reflectance mode or using suitable solvents in transmission mode.
Thank you, Rathinam. UV Vis spectra module typically appears in commercial or free software, but those simulation typically requires precise structure and energy potential, for any clusters new, do you have some advice?