15min:

M. EL AZZAOUI AND J. VANDER AUWERA, Laboratoire de Chimie Physique Moléculaire C. P. 160/09, Université Libre de Bruxelles, 50 avenue F. D. Roosevelt, B-1050 Brussels, Belgium.

Spectra of C₂H₂ have been recorded at room temperature in the range from 1140 to 1490 cm^-1 using a Bruker IFS120HR spectrometer. The interferograms were collected with a maximum optical path difference of 300 cm. Sample pressure/absorption path length products ranging from 1.3 to 330 hPa*cm were used. Absolute line intensities have been measured using direct non-linear least squares fitting of Voigt profiles --- convoluted with an instrument line shape function --- to the observed spectral data. Measurements have been performed in the ₄ + ₅ cold band and in hot bands originating from levels involving the bending modes ₄ and ₅ . The results and analysis of the measurements will be presented and discussed.