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Diode–Laser Measurements of N2-Broadening Coefficients in the ν7 Band of C2H4

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

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
123 KB
Volume
201
Category
Article
ISSN
0022-2852

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✦ Synopsis

N 2 -broadening coefficients have been measured for 35 lines of C 2 H 4 in the 7 fundamental transition, using a tunable diode-laser spectrometer. These lines with 3 Յ JЉ Յ 23, 0 Յ K Љ a Յ 4, and 1 Յ K Љ c Յ 22 are located in the spectral range 880 -1024 cm Ϫ1 . The collisional half-widths are obtained by modeling each spectral line with a Voigt and a Rautian profile. The measured broadening coefficients belonging to transitions with the same JЉ generally increase with increasing K Љ a and the coefficients decrease on the whole with increasing JЉ. These behaviors can be predicted by an approximate semiclassical calculation performed by approximating ethylene to a prolate symmetric-top molecule.

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