Determination of absorption cross sections for oxygen molecules in the Schumann-Runge band region at high temperatures |
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Authors: | I E Zabelinskii L B Ibragimova O P Shatalov |
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Institution: | (1) Institute of Mechanics, M. V. Lomonosov Moscow State University, 1 prosp. Michurinskii, Moscow, 119192 |
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Abstract: | We have measured the absorption cross sections of oxygen molecules in oxygen and in an oxygen-argon mixture heated by a shock
wave, in the wavelength range 190–250 nm at temperatures of 1500–7000 K, for thermal equilibrium conditions behind the shock
wave front. Analysis of the absorption cross sections obtained allowed us to select a data set that adequately describes the
absorption characteristics of the electronic transition X3Σ
g
−
→ B3Σ
u
−
for the oxygen molecule.
In order to approximate the temperature dependence of these cross sections at a temperature of 1500–4500 K, we chose the function
σ(λ, T) = σ0(λ)(1 − exp (−θ/T)) exp (− n*θ/T) where θ0 = 1.4·10−17, 1.4·10−17, 1.2·10− 17, and 1.3·10−17 cm2, n* = 3.1, 4.1, 5.6, and 7.47 for wavelengths 190, 210, 230, and 250 nm, respectively; θ = 2240 K is the characteristic temperature
of the O2 molecules. The approximation error was 19–25% and did not exceed the experimental error.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 1, pp. 13–17, January–February, 2006. |
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Keywords: | absorption cross section of molecular oxygen Schumann-Runge system electronic transition UV spectrum electronic ground state and excited state of a molecule shock wave |
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