Rydberg orbital Ethane

Ethylene has been chosen for our second case study in far-ultraviolet Rydberg-valence spectroscopy. While more details are known about ethylene than about ethane, the main points can be treated more succinctly. The complications in the case of ethane were due to the existence of close-lying initiating o-orbitals. Yet, for ethylene too, problems remain. 

Teller split Eg state interacts with the other Ag (3aig) state of the ion causing the complicated band structure of the PE bands at 12.7 and 13.4 eV. This strongly suggests that the initiating orbital of the structured 3p Rydberg band is also the leg orbital. Furthermore, the photochemistry of ethane indicates that most (but not aU) of Its photolysis takes place at the (ICg, 3s) state. 

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