RYDBERG ABSORPTION SERIES AND IONIZATION ENERGIES OF OXYGEN MOLECULE .I.

Rydberg absorption series of O2 have been investigated with a 6.6-m normal-incidence vacuum spectrograph in the first and second orders in the 600-750-Å region. Previous observations have been improved upon, and it has been possible to obtain much more accurate ionization energies for the b 4∑g-and B 2∑g- states of O2+. The data are compared with recent results obtained in the investigation of the electron energy spectrum of photoionized O2+. Another Rydberg series converging to the B 2∑g- state has been observed and is now reported for the first time.