Structure of Molecular Rydberg States in Supercritical Alkanes Gary L. Findley, Chemistry Department, University of Louisiana at Monroe Monroe, LA 71209 We have successfully simulated the absorption spectra of CH3I in Ar, Kr and Xe using a single set of intermolecular potential parameters for each dopant/ perturber system. Example simulations of CH3I in Ar are shown to the left as blue lines in comparison to experiment (black lines). The first moment of the simulated band is given below and clearly illustrates the critical point effect (red points). Current studies focus on the structure of CH3I Rydberg states in CH4 and CF4.