ELECTRONIC-TRANSITION MOMENTS FOR THE HERZBERG-I BANDS OF O-2

Recently published extensive high-resolution measurements of absolute integrated photoabsorption cross sections for rotational lines of the (nu' = 4-11, nu '' = 0) bands of the O-2 Herzberg I system have been f itted using general rotational line-strength formulae for (3) Sigma(u) (+) <-- (3) Sigma(g)(-) transitions. Good fits were obtained using onl y three independent electronic transition-moment parameters that accou nted for transition strength borrowed from electric-dipole-allowed tra nsitions through spin-orbit and orbit-rotation interactions involving both upper and lower states of the transition. Absolute values of tran sition-moment parameters have been obtained, corresponding to R-centro ids from 1.29 to 1.32 Angstrom (1 Angstrom = 10(-10) m). Band oscillat or strengths derived from the calculated integrated line strengths are in good agreement with most experimental measurements. Principal elec tronic matrix elements have been estimated by assuming that strength i s borrowed from only two electric-dipole-allowed transitions.