Intensities and half-widths of self-broadened N2O have been measured in the 00°1–10°0 band by a spectroscopic method using a stabilized, single line, single mode laser source.On the other hand, line overlap has permitted us to point out a deviation from Lorentz line shape for pressures greater than atmospheric pressure. An attempt to interpret this difference by a semi-empirical formalism is proposed, proceeding from "super Lorentz" line shape recently introduced by Varanasi.