Predissociation linewidths of the (1,0)–(12,0) Schumann–Runge absorption bands of O2 in the wavelength region 179–202 nm
Open Access
- 15 January 1990
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 92 (2) , 842-849
- https://doi.org/10.1063/1.458117
Abstract
A nonlinear least‐squares method of retrieving predissociation linewidths from the experimental absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 3 1, 339 (1983)] has been applied to the (1,0)–(12,0) Schumann–Runge bands of oxygen. Predissociation linewidths deduced for the Schumann–Runge bands are larger than the theoretical predictions of Julienne [J. Mol. Spectrosc. 6 3, 60 (1976)] and the latest measurements of Lewis et al. [J. Quant. Spectrosc. Radiat. Transfer 3 6, 187 (1986)]. The larger linewidths found will have an impact on calculations of solar flux penetration into the Earth’s atmosphere and of the photodissociation rates of trace species in the upper atmosphere. Systematic variation of predissociation linewidths with rotational quantum number is observed in the bands (v’,0) with v’=6, 8, 9, 11, and 12.Keywords
This publication has 29 references indexed in Scilit:
- Aeronomic problems of molecular oxygen photodissociation—III. Solar spectral irradiances in the region of the O2 Herzberg continuum, Schumann-Runge bands and continuumPlanetary and Space Science, 1988
- High resolution absorption cross-sections and band oscillator strengths of the Schumann-Runge bands of oxygen at 79 KPlanetary and Space Science, 1987
- Atmospheric odd oxygen production due to the photodissociation of ordinary and isotopic molecular oxygenPlanetary and Space Science, 1987
- Herzberg continuum cross section of oxygen in the wavelength region 193.5–204.0 nm and band oscillator strengths of the (0, 0) and (1, 0) Schumann–Runge bandsCanadian Journal of Physics, 1984
- High resolution absorption cross section measurements and band oscillator strengths of the (1, 0)−(12, 0) Schumann-Runge bands of O2Planetary and Space Science, 1983
- Photoelectric scanning (665-m) spectrometer for VUV cross-section measurementsApplied Optics, 1980
- Predissociation of the Schumann-Runge bands of O2Journal of Molecular Spectroscopy, 1975
- Critical review of ultraviolet photoabsorption cross sections for molecules of astrophysical and aeronomic interestReviews of Geophysics, 1971
- Absorption cross sections of the Schumann-Runge bands of molecular oxygenPlanetary and Space Science, 1970
- Dissociation Processes in Oxygen above 1750 A.The Astrophysical Journal, 1957