Vertical excitation energies of the CF3Cl molecule have been obtained from a response function approachwith a CC reference function to determine absolute photoabsorption oscillator strengths in the molecular-adapted quantum defect orbital formalism (MQDO). The present work covers more highly excited Rydbergstates than have been experimentally reported. Assessing of the reliability of the present calculations is providedthrough a comparative analysis between the results of the molecule and the Cl atom. This can be used toallow for predictions of the same type of properties in other analogous systems.