MEASUREMENT OF COLLISION BROADENING BY HYDROGEN AND NITROGEN OF ACETYLENE LINES IN THE $14 \mu m$ REGION USING A TUNABLE DIODE LASER SPECTROMETER

$^{1}$ W. E. Blass and V. W. L. Chin, JQSRT 38, 185 (1987). $^{2}$ D. Lambot, G. Blanquet and J.-P. Bouanich, J. Mol. Spec. 136, 86 (1989). $^{3}$ K. F. Lin, W. E. Blass, and N. M. Gailar, J. Mol. Spec. 79, 151 (1980).Author Institution: Molecular Spectroscopy Laboratory, Department of Physics and Astronomy, The University of TennesseeUsing a tunable diode laser system at $0.0005 cm^{-1}$ resolution, the line widths of acetylene, broadened by hydrogen and nitrogen, are currently being studied. Hydrogen and nitrogen have been previously used as perturbers in the $\nu_{5}$ band of $C_{2}H_{2}$ by Blass and $Chin,^{1}$ while oxygen and nitrogen have been used as the perturbing gases by Lambot $et al.^{2}$ The collisional line widths are determined in a least mean squares sense from the aggregate set of observations using a stepwise multiple regression program with $bi-weights.^{3}$ The collision broadening coefficients will be determined for both hydrogen and nitrogen. Current work includes verification of previous results and the extension of line width measurements over a larger range of J values for $\nu_{5}$ and several $14 \mu m$ hot bands