Abstract

The new technique of Wampler and Gentry for determining the temperature and density of a gas by measuring UV gas absorption at two wavelengths [ F. B. Wampler and R. A. Gentry, J. Appl. Phys. 52, 15831981)] has been applied to gaseous UF₆. At 266 nm the absorption cross section σ of UF₆ appears to be constant, σ = (1.15 ± 0.01) 10⁻¹⁸ cm² from 0–100°C. The absorption cross section at 245 nm over the same temperature range may be represented with the empirical polynomial σ = [1.37 ± 0.05 + (9.7 ± 1.5) 10⁻³ ⋅ T − (4.2 ± 1.1)10⁻⁵ ⋅ T²] 10⁻¹⁸ cm², where T is in degrees Celsius. Differences in (dσ/dT)_λ at 266 and 245 nm allow both UF₆ temperature and density to be determined by UV absorption measurements. The strengths and limitations of this technique are discussed.

© 1981 Optical Society of America

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