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Updated: Jun 14, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Gas temperature and density of UF(6) determined by two-wavelength UV absorption
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, 1583 1981)] has been applied to gaseous UF(6). At 266 nm the absorption cross section sigma of UF(6) appears to be constant, sigma = (1.15 +/- 0.01) 10(-18) cm(2) from 0-100 degrees C. The absorption cross section at 245 nm over the same temperature range may be represented with the empirical polynomial sigma = [1.37 +/- 0.05 + (9.7 +/- 1.5) 10(-3). T - (4.2 +/- 1.1)10(-5). T(2)] 10(-18) cm(2), where T is in degrees Celsius. Differences in (dsigma/dT)lambda at 266 and 245 nm allow both UF(6) temperature and density to be determined by UV absorption measurements. The strengths and limitations of this technique are discussed.
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