Band oscillator strengths of the Herzberg I bands of O2

Abstract

Photoabsorption cross section measurements of the Herzberg I bands (A3Σu+−X3Σg−) of O2 have been made by Fourier transform spectrometry with a resolution of 0.06 cm−1 in the wavelength region 240-270 nm. Precise band oscillator strengths of the (4,0)–(11,0) bands are obtained by direct measurement, and for some of the strong bands, they are significantly higher than the previous experimental values. The rotational line strengths and the branching ratios are also presented for the same bands. The dissociation energy of O2 is discussed.