The energy scheme of ethyl iodide has been studied by excitation of the valence and Rydberg states lying in the near u v and uv (3-10eV) by electron impact and the angularly resolved electron energy loss spectroscopy. The lowest energy valence triplet states have been identified in the 3-5.5 eV region with a maximum of transition probability around 4.3 eV and at 4.78 eV respectively. Additional valence singlet and/or triplet states have been suggested to be located between 5 and 6 eV. For the Rydberg series, several electronic states contribute to the lowest energy terms ofthe Rydberg bands. The differential cross sections for the B, C and D Rydberg bands have been measured and confirm that each state within the electronic multiplet in each,band has a differential cross section different from that of the other. In addition excitation of the A, states is very likely responsible of a minimum in the D/C and D/B differential cross section ratios. In addition the first terms of two new nd series converging to each spin-orbit component of the ionic ground state have been reported. Vibrationai levels of the E(1) states which are the most intense in pseudo-optical conditions have been partly resolved for the first member of the ns, fzp and nd series.
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