scholarly journals Absolute Intensities of the Discrete and Continuous Absorption Bands of Oxygen Gas at 1.26 and 1.065 μ and the Radiative Lifetime of the 1Δg State of Oxygen

1965 ◽  
Vol 43 (12) ◽  
pp. 4345-4350 ◽  
Author(s):  
Richard M. Badger ◽  
Alan C. Wright ◽  
Rodger F. Whitlock
Keyword(s):  
Radiative Lifetime ◽  
Absorption Bands ◽  
Absolute Intensities ◽  
Continuous Absorption ◽  
Oxygen Gas

Absorption Cross Sections of Stratospheric Molecules

1974 ◽  
Vol 52 (8) ◽  
pp. 1465-1478 ◽  
Author(s):  
R. D. Hudson
Keyword(s):  
Absorption Spectrum ◽  
Solar Radiation ◽  
Band Structure ◽  
Molecular Oxygen ◽  
Cross Sections ◽  
Absorption Bands ◽  
Atmospheric Species ◽  
Continuous Absorption ◽  
Line Widths ◽  
The Cross

Photoabsorption cross sections necessary for calculations of the equilibrium conditions in the stratosphere fall into two distinct classes: cross sections for molecular oxygen and ozone, which control the transmission of solar radiation; cross sections for minor atmospheric species which are optically thin to solar radiation, and which are needed to calculate their rates of dissociation.The principal absorption features of molecular oxygen are absorption bands of the Schumann–Runge system between 175 and 200 nm and a weak dissociation continuum which extends from 175 to 260 nm. The band structure consists of many sharp rotational lines, and it is necessary to calculate cross sections using measured band parameters. Two measurements of the line widths for these bands have obtained large line widths (∼1 cm−1) indicating predissociation. The agreement between the two sets of data is good for only a few lines. This has implications in the calculation of the transmission of solar radiation to the lower stratosphere. The continua have been measured by four groups. The results agree, within the respective experimental errors, near 220 nm, but disagree near 250 nm.Ozone has a continuous absorption spectrum between 175 and 300 nm with band structure above 300 nm. Four sets of data are available which agree within ±2%. The cross section above 300 nm is temperature dependent. The cross sections for the minor species are in general not as well known. In nitric oxide, carbon monoxide, ammonia, and sulfur dioxide, band structure dominates the absorption spectrum, and cross sections have been measured at insufficient spectral resolution. Other species, such as nitric acid, hydrogen peroxide, water vapor, carbon dioxide, nitrous oxide, and nitrogen dioxide, have continua over the entire spectra range from 175 to 300 nm. Cross sections for these species have been measured; however, cross sections for many molecules, e.g., N2O5, NO3, etc., have not been studied.

Oxygen Gas Continuous Absorption in the Extreme Ultraviolet*

1955 ◽  
Vol 45 (9) ◽  
pp. 767 ◽  
Author(s):  
A. A. Aboud ◽  
J. P. Curtis ◽  
R. Mercure ◽  
W. A. Rense
Keyword(s):  
Extreme Ultraviolet ◽  
Continuous Absorption ◽  
Oxygen Gas

Interpretation of the visible and near-infrared absorption spectra of compressed oxygen as collision-induced electronic transitions

1969 ◽  
Vol 47 (24) ◽  
pp. 2859-2871 ◽  
Author(s):  
G. C. Tabisz ◽  
Elizabeth J. Allin ◽  
H. L. Welsh
Keyword(s):  
Near Infrared ◽  
Low Frequency ◽  
Rotational Transition ◽  
Electronic Transitions ◽  
Absorption Bands ◽  
Specific Effects ◽  
Band Origin ◽  
Continuous Absorption ◽  
Compressed Gas ◽  
Large Width

The intensity profiles of some of the broad continuous absorption bands of oxygen in the near-infrared and visible regions were measured in the compressed gas over a range of pressures and temperatures. Three single electronic transitions (12 600, 10 600, 07620 Å) and three double transitions (6290, 5770, 4770 Å) were studied in detail. The asymmetry of the band profiles is shown to arise from a Boltzmann relation between the intensity distributions in the high and low frequency wings when the band origin is properly chosen. By assuming an appropriate rotational structure and broadening each rotational transition by a Boltzmann-modified dispersion curve the profiles of the bands could be reproduced with only minor discrepancies. These criteria, along with the well-known quadratic density dependence of the intensity, show that the bands are properly interpreted as collision-induced electronic transitions. The large width of the translational broadening functions required in the analysis indicates that the induction must be predominantly due to overlap interaction. No specific effects of (O2)2 complexes are identifiable in the spectra.

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