Abstract
The line shapes of the rovibrational components of the atmospheric A-band of oxygen perturbed by nitrogen have been measured by a near infrared diode laser spectrometer using second harmonic detection technique. In the low pressure region, with the increase of perturber pressure the measured line widths show a very slow increase resulting from the combined effect of collisional narrowing and pressure broadening. When the total pressure exceeds 100 Torr, the line widths increase linearly with the perturber pressure for a fixed partial pressure of oxygen. However, the line shape remains non-Voigt in nature. It is found that the narrowing produced by the perturber gas is less pronounced than that produced by the self-induced collision. The simulation of line profiles based on the soft collision Galatry model provides the coefficients of collisional narrowing and pressure broadening. © 1997 Elsevier Science B.V.
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