Check for related topic on ResearchGate: https://www.researchgate.net/post/How_can_I_calculate_a_UV-Vis_Spectrum_using_Gaussian_03 (it is in gas phase), also for spectra calculations is condensed phase (solvents) https://www.google.ru/?gfe_rd=cr&ei=JM7YV-mEHYeEYIHPnrAK&gws_rd=ssl#newwindow=1&q=VIS+spectra+calculation