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Collisional Parameters of Lines: Effect of Temperature by G. Wagner; M. Birk; R.R. Gamache; J.-M. Hartmann is a Engineering article available to read on EtoBox.

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High-resolution Fourier transform spectra of H 2 O-air mixtures have been measured at 296, 742, and 980 K for total pressures of 0.5 and 1.0 atm in the region of the n 2 band. From these recordings, airbroadening coefficients have been determined for the doublet lines with K c 1⁄4 J: From these data and previous experimental determinations, line-broadening parameters gðTÞ are obtained at all three temperatures for the doublet lines from J 1⁄4 0 up to 16. These values are then used to deduce the temperature-dependence exponent n such that gðTÞ 1⁄4 gð296Þ Â ð296=TÞ n : The values of n obtained using the two elevated temperatures are consistent and show that line widths decrease with T for small J-values ðn % þ0:8Þ; are almost temperature independent on T for J % 10; and increase with T for high J lines (n % À0:3 for J % 15). This original result, which confirms theoretical predictions made about 15 years ago with a semi-classical approach (J. Chem. Phys. 86 (1987) 144), is analyzed here using an improved version of the model. Comparisons between measured and computed widths show that calculations cannot correctly reproduce the experimental results at all temperatures simultaneously.

Who reads Collisional Parameters of Lines: Effect of Temperature?

Author

G. Wagner; M. Birk; R.R. Gamache; J.-M. Hartmann

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0022-4073)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)