Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at room temperature

Using a tunable diode-laser spectrometer, we have measured the N2-broadening coefficients of 32 absorption lines in the ν10 band of allene at room temperature. For each line under study, we have recorded spectra at five pressures of perturber gas ranging from 7 to 37 mbar. The line profiles have been fitted, at each pressure, with different lineshape models. From these fits, we have obtained the collisional half-width at each pressure and determined accurately the N2-broadening coefficients.

► A description of the improved tunable diode-laser spectrometer used is realized. ► Collisional broadenings of allene diluted in nitrogen were measured. ► The high resolution has allowed accurate measurements of the very dense spectra. ► Broadening coefficients were determined by fitting Voigt and Rautian profiles. ► This is the first study of these parameters of allene at room temperature.