Knowledge Bank

Using a tunable diode laser system at $0.0005cm-1$ 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 $C2H2$ by Blass and $Chin,1$ while oxygen and nitrogen have been used as the perturbing gases by Lambot $etal.2$ 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.