Fourier transform spectroscopy and cross-section measurements of the Herzberg II bands of O-2 at 295 K

Fourier transform spectroscopic measurements of the absorption bands of the Herzberg II (c (1)Sigma(u)(-)-X (3)Sigma(g)(-)) of O-2 at 295 K have been made with a resolution of 0.06 cm(-1) in the wavelength region 240-275 nm. Rotational line positions are determined with an accuracy of 0.005 cm(-1), and rotational term values are presented for the vibrational levels, v(')=6 -16. Precise band oscillator strengths of the (7,0)-(16,0) bands are obtain ed for the first time by direct measurement by summing the cross sections o f individual rotational lines of the bands. The rotational line strengths a nd the branching ratios are also presented for the same bands. (C) 1999 Ame rican Institute of Physics. [S0021-9606(99)01531-7].