Study of higher excited Rydberg states in ethylene

This is the authors' abstract. We don't add key points for this paper.

The photoabsorption and photoionization spectra of ethylene have been shown to exhibit weak broad structures in the spectral region between the ionization threshold and 1060 Å. Some members of three Rydberg series that converge to the first excited electronic state Ã(2B3) of C2H+4 have been identified. They have been tentatively assigned as transitions from the ground state to the 4sσ-, 4pσ-, 3d-, and 4d-Rydberg states. The C2H4 molecule is suggested to be twisted in at least the 4sσ- and nd-Rydberg states.