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Line-Mixing Effects in He- and N2-Broadened Q Branches of C2H2 at Low Temperatures

✍ Scribed by Ghislain Blanquet; Jacques Walrand; Jean-Pierre Bouanich

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 178 KB
Volume: 210
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.2001.8441

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✦ Synopsis

Two Q branches of C 2 H 2 near 716.3 and 719.9 cm -1 of ← symmetry have been studied for He and N 2 perturbers at pressures ranging from 0.05 to 0.8 atm and low temperatures (-75 and -90 • C) using a tunable diode-laser spectrometer.

To interpret the strong line-mixing effects observed in these spectra, we have applied a model based on the energy corrected sudden approximation (ECS) whose parameters are derived from those previously determined at room temperature through a fitting procedure of line-broadening coefficients. These coefficients have been measured for a few lines of C 2 H 2 perturbed by He at -100 • C. The ECS model provides satisfactory agreement with experimental bandshapes for both bands, temperatures and perturbers at pressures generally higher than 0.1 atm.

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