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Investigation of the Collision-Induced Absorbtion by O2 Near 6.4 Micro ńin Pure O2 and O2/N2 Mixtures

Published

Author(s)

B Mate, C Lugez, A M. Solodov, Gerald T. Fraser, Walter J. Lafferty

Abstract

The collision-induced fundamental vibrational band of molecular oxygen has been measured between 1300 and 2000 cm-1 using a Fourier-transform infrared spectrometer and an optical path length of 84 m. Spectra were recorded for pure O2 and O2/N2 mixtures at densities up to 10 times the density of an ideal gas at standard temperature (273.15 K) and pressure (101.325 kPa), and for temperatures between 228 and 296 K. The band is dominated by the δJ = 0, Q-branch and the δJ = 2, S and δJ = -2, O-branch shoulders, with the S branch exhibiting ripples previously attributed to bound dimer transitions, pure quadrupole transitions of O2 perturbed by line mixing, and intercollisional interferences. The ripples are seen at the same wavenumbers in O2-Ar mixtures, with intensities dependent on both the O2 and Ar densities, suggesting that the ripples are not due to bound dimer transitions. The integrated band intensity, S, is related to the collision-induced absorption coefficients by S = SO2-O2P2O2 + SO2-N2 PO2 PN2, where SO2-O2 and O2-N2 collisions, respectively, and PO2 and PN2 gas densities. We find values for SO2-O2 = 6,972(66) x 10-4cm and Sod2^-N2 = 7.12(22) X 10-4 cm-2, respectively, at 296 K, when the gas density is equal to that found at STP (i.e., SO2-O2 = 6.972(66) x 10-4 cm-2 and SO2-N2 = 7.12(22) x 10-4 cm-2, respectively, at 296 K, when the gas density is equal to that found at STP (I.e., SO2-O2 = 6972(6) x 10-4 cm02 amagat-2 and SO2-N2 = 7.12(22) x 10-4 cm-2 amagat-2).
Citation
Journal of Geophysical Research
Volume
105
Issue
No. D17

Keywords

atmospheric absorption, continuum absorption, electronic spectroscopy, FTIR oxygen

Citation

Mate, B. , Lugez, C. , Solodov, A. , Fraser, G. and Lafferty, W. (2000), Investigation of the Collision-Induced Absorbtion by O<sub>2</sub> Near 6.4 Micro &#324;in Pure O<sub>2</sub> and O<sub>2</sub>/N<sub>2</sub> Mixtures, Journal of Geophysical Research (Accessed May 20, 2024)

Issues

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Created September 1, 2000, Updated February 17, 2017