The absorption spectra of the O-2 Herzberg band systems (A(3)Sigma(u)(+)-X(
3)Sigma(g)(-), c(1)Sigma(u)(-)X(3)Sigma(g)(-), and A' (3)Delta(u)-X(3)Sigma
(g)(-)) lying in the wavelength region 240-300 nm were reinvestigated. The
coupling of a long absorption cell and a high-resolution Fourier transform
spectrometer has allowed the observation of numerous weak lines which were
not reported previously. From the rotational analysis of the line positions
, determined with an accuracy of 0.005 cm(-1), the molecular constants of t
he A(3)Sigma(u)(+), v = 0-12, c(1)Sigma(u)(-), v = 2-19, and A' (3)Delta(u)
, v = 2-12 levels are improved significantly, The interaction between the A
and c states is described quantitatively. A new interpretation of the pert
urbations observed in the energy region close to the dissociation limit is
given which involves a weakly bound (3)Pi(u) state as the most probable per
turbing state. (C) 1999 Academic Press.