FOURIER-TRANSFORM SPECTROSCOPY OF THE HERZBERG-I BANDS OF O-2

Fourier transform spectroscopic measurements of the absorption bands o f the Herzberg I system (A(3) Sigma(u)(+)-X(3) Sigma(g)(-)) of O-2 hav e been made in the wavelength region 240-270 nm. Rotational line posit ions are determined with an accuracy of 0.005 cm(-1), and rotational t erm values are presented for the vibrational levels, upsilon = 4-11. M olecular constants of these levels are also presented. Interactions wi th the c(1) Sigma(u)(-) state are observed at J = 13 of the upsilon = 4 level, at J = 16 of the upsilon = 7 level, and at J = 15 and 24 of t he upsilon = 9 level of the A(3) Sigma(u)(+) state. Another interactio n around J = 10 of the upsilon = 11 level might result from the weakly bound (IIu)-I-3 state.